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山西开放式肛肠科多媒体教学系统
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发布时间: 2025-06-01 09:27:50北京青年报社官方账号
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  山西开放式肛肠科多媒体教学系统   

Screen time has become a common concern during the pandemic, as many school districts turn to online learning. That has doctors telling parents to pay close attention to their children's eyes. "Everybody, adults and kids, can develop computer eye strain. That's mostly because there's a decrease in the blink rate, incomplete eye closure with the blink rate," said Dr. Cate Jordan, a pediatric ophthalmologist with the American Association for Pediatric Ophthalmology and Strabismus. Dr. Jordan says eye drops or a warm compress can help children with eye irritation because of increased technology use. But most of all, make sure your eyes get some relief from a screen."In between classes, take a break. Look out a distance and take a couple hard blinks. I really recommend really taking a few hard blinks because it pumps the oil glands and really helps lubricate the eyes," said Dr. Jordan.Stephen Reid is the co-founder of Hue Eyewear. Reid and his wife founded their blue light glasses company when they noticed their children suffered side effects from too much screen time. "With the amount of time we're spending on our screens right now, especially during the pandemic, we need to make sure that we protect ourselves," said Reid.Reid says the glasses protect children and adults from blue light that's emitted from computer, tablet, phone and even television screens. "My children use the glasses. Ever since we started the company they've been using them and they tell me their eyes are less strained and I can feel it, too," said Reid.Dr. Jordan says more studies need to be done on the effectiveness of blue light glasses. Our eyes naturally protect against harmful rays that could affect our eyesight, she adds. "If you've already bought them and a child feels better and wants to use them, then absolutely there's no harm in wearing them. But there's no need to have every child wearing blue light glasses," said Dr. Jordan.Dr. Jordan says too much blue light at the end of the day can disrupt your circadian rhythm, or sleep cycle, so she recommends children make an effort to avoid screens at least two hours before bed time. 2150

  山西开放式肛肠科多媒体教学系统   

SAN FRANCISCO (KGTV) -- A California assemblyman from San Francisco wants to end tax breaks for companies that contract or subcontract the proposed border wall along the U.S.-Mexico border.Democratic Assemblyman Phil Ting said 375 companies are interested in the opportunity to work on the wall while 73 percent of Californians are opposed to the project.According to Ting, California is home to 2.7 million undocumented immigrants who make up 10 percent of the workforce.Assembly Bill 2355 would prohibit companies that contract to build the wall from benefiting from the tax exemptions listed below: 609

  山西开放式肛肠科多媒体教学系统   

Searching for the cheapest airfare may be the most popular way of deciding on a flight, but secret extras baked right into the ticket may bring extra value to your booking, no matter how much you paid.Follow these three lessons to ensure that you're maximizing the value of a travel booking for more than just the flight alone.1. Know the codeA single letter of the alphabet lets the airline know where in the hierarchy of airfares your ticket ranks.This is known as the fare basis code, and though passengers typically overlook it, this miniscule mark is the key to unlocking important information regarding your booking, including how easy it is to make a change to the ticket, how eligible you are for an upgrade, and how many frequent flier miles may be earned.Airlines do not make it easy to research fare codes, as they are often in the fine print, but taking an extra minute to locate and research what it means for your ticket can make all the difference.Matthew Ma, co-founder of airfare sale website The Flight Deal, is an advocate for understanding fare codes, and makes a point of including the code information with each deal post.As Ma tells CNN Travel: "Knowing the fare code means knowing whether or not the ticket you just purchased will earn frequent flier miles, which help you to see more of the world for less."Ma cites a flight he booked to Jordan as an example."Most of Royal Jordanian's cheap fares are 'R' or 'N' fare codes, which earn no frequent flier miles in [its alliance partner] American Airlines' program," he says."When the airline offered a sale with higher 'L' fares on offer, I booked that, and I'll earn American Airlines miles. This means miles for either future travel and upgrades, and a chance at elite status for further airline perks."While deciphering a fare code and what it means for your ticket may take a bit of squinting at your computer screen, there's always the option to call the airline and have an agent explain the fare code and fare rules in plain terms.They'll also be able to advise on higher codes for the same flight, for a little more money, but potentially yielding more frequent flier miles and fewer change restrictions.2. Schedule a stopoverIn the realm of commercial air travel, there are layovers and there are stopovers.A layover involves the typical rigamarole of getting off one flight, waiting a few hours at an interim airport, and boarding another flight to your destination. You may have time for a meal or to catch up on a good book, but layovers are hardly a vacation.A stopover, on the other hand, is a full break between flights, where the passenger gets off of a flight at an airport, and has meaningful time, often multiple days, to explore that city before rejoining their itinerary to continue on to the true destination.Stopovers essentially allow two-for-the-price-of-one trips."Paid tickets frequently let you add a stop in an airline's hub either for free or for a modest extra charge," notes Gary Leff, travel points guru and blogger at View From the Wing."Stopovers are even more valuable on award bookings as, for instance, you can have a free stop along the way, requiring no additional miles, but maybe modest extra airport taxes.On my honeymoon, I visited both Tahiti and Australia for the same mileage required for just Australia. En route to Southeast Asia on another trip, I visited Dubai without spending extra miles or money, and had tea at the Burj al Arab."Some airlines promote their free stopover policies in the name of travel marketing, encouraging visitors to spend time (and money) in their hub.For passengers flying Hawaiian Airlines from the US to Asia, the airline allows for multi-day stopovers in Honolulu. Similar policies exist for Emirates with Dubai, Icelandair with Reykjavik, Finnair with Helsinki, KLM with Amsterdam and Japan Airlines with Tokyo.To discover if a free stopover is possible with your ticket, and get two destinations for the price of one, attempt a "multi-city" search on the airline's website or call the airline to inquire about stopover rules on both paid or award tickets.3. Save that boarding passThe flight is over and you've claimed your luggage. That's the end of it, right? Wrong, if that boarding pass you stuffed in your wallet is one from an airline offering post-flight discounts at destinations.For example, fly Turkish Airlines to visit Petra, considered one of "new seven wonders of the world," and show your boarding pass at the entrance gate for 15% off the per person entrance fee.In South Korea, Korean Air and Asiana compete to offer similarly valuable boarding passes, with discounts on admission to cultural performances and theme parks, gift cards to department stores, half-price rentals of Wi-Fi routers, and even 10% off "medical services" at a plastic surgery and dental center in Seoul.Saving your boarding pass now means saving on the total of a tooth whitening regimen on the other side of the world.The king of boarding passes-as-tickets to free experiences is undoubtedly Alaska Airlines, whose current wine tourism and ski vacation promotions give passengers post-flight access to complimentary tastings at wineries in Oregon and Washington state, and free ski passes at 12 West Coast ski resorts."We encourage travelers to fly right into the resort town, rather than drive, and then use our boarding passes to jumpstart their ski vacation," says Elliott Pesut, Alaska Airlines' director of product marketing."The ski passes and the wine programs are such cool benefits for our guests. We know they're passionate about these leisure activities, and we know that we can give them a great experience beyond the flight."The-CNN-Wire 5710

  

SCRIPPS — For almost 75 years, the stern of the destroyer USS Abner Read lay somewhere below the dark surface of the Bering Sea off the Aleutian island of Kiska, where it sank after being torn off by an explosion while conducting an anti-submarine patrol.Seventy-one U.S. Navy sailors were lost in the aftermath of the blast, during a brutal and largely overlooked early campaign of World War II.Heroic action by the crew saved the ship, but for the families of the doomed sailors, the final resting place of loved ones lost in the predawn hours of Aug. 18, 1943, remained unknown.On July 17, a NOAA Office of Exploration and Research-funded team of scientists from Scripps Institution of Oceanography at the University of California San Diego and the University of Delaware aided by four U.S. Navy sailors assigned to the Naval Special Warfare Group discovered the missing 75-foot stern section in 290 feet of water off Kiska, one of only two United States territories to be occupied by foreign forces in the last 200 years.“This is a significant discovery that will shed light on this little-known episode in our history,” said retired Navy Rear Adm. Tim Gallaudet, PhD, acting undersecretary of commerce for oceans and atmosphere and NOAA administrator. “It’s important to honor these U.S. Navy sailors who made the ultimate sacrifice for our nation.”Abner Read was on patrol at about 1:50 a.m. when the massive explosion — presumed to be from a Japanese mine — ripped the destroyer apart. Somehow the crew kept the main part of Abner Read’s hull watertight, and two nearby Navy ships towed it back to port.“This was catastrophic damage that by all rights should have sunk the entire ship,” said?Sam Cox, curator of the Navy and director of the Naval History and Heritage Command.Within months, the destroyer was back in the war.It went on to fight in several battles in the Pacific Theater before being destroyed in November 1944 by a Japanese dive bomber in a kamikaze attack during the battle of Leyte Gulf. Abner Read received four battle stars for her World War II service.Meanwhile, the ship’s shorn stern was lost but not forgotten. Finding it was a primary goal of the July mission to document the?underwater battlefield off Kiska.In addition to NOAA and Scripps, the project was supported by Project Recover, a public-private partnership that uses 21st-century science and technology and archival and historical research to find the final underwater resting places of Americans missing in action since WWII.Historians have been able to study battles on Kiska and Attu, the Aleutian islands that were attacked and occupied by as many as 7,200 Japanese forces from June 1942 to mid-August 1943, but this Kiska mission was the first to thoroughly explore the underwater battlefield.Many ships, aircraft and submarines from both the United States and Japan were lost during a punishing 15-month campaign to reclaim this distant windy and fogbound corner of America.Now, recent advancements in undersea technology, many developed by the Office of Naval Research, are helping to reveal the forgotten histories of long-ago valor.After multibeam sonar mounted to the side of the research ship?Norseman II identified a promising target, the team sent down a deep-diving, remotely operated vehicle to capture live video for confirmation.“There was no doubt,” said expedition leader Eric Terrill, an oceanographer at?Scripps Institution of Oceanography and co-founder of Project Recover. “We could clearly see the broken stern, the gun and rudder control, all consistent with the historical documents.”“We’ve entered a new age of exploration,” added Mark Moline, director of the?School of Marine Science and Policy at the University of Delaware and co-founder of Project Recover. “New sensors and improved underwater robots that can bring back real-time images are driving new discoveries.”Wrecks like Abner Read are protected from activities that disturb, remove, or damage them or their contents by the?Sunken Military Craft Act of 2004, though exceptions can be made for activities that have archaeological, historical, or educational purposes.The twisted metal and sharp edges of sunken military wreckage can pose life-threatening risks to divers, but according to the Naval History and Heritage Command, there’s a more important reason to protect sites like the Abner Read. They are often war graves, recognized by the U.S. Navy as the fit and final resting place for those who perished at sea.“We take our responsibility to protect those wrecks seriously,” said Cox. “They’re the last resting place of American sailors.” 4715

  

School choice can mean a lot of things, and for some parents, it means homeschooling.Elizabeth Bell, who lives in Fairfax County, Virginia, made the decision to homeschool her five children—ages 12, 9, 6, 4 and 2."We have a syllabus,” explains Bell. “It's like, day by day, check it off."Bell says she made the decision to homeschool her children after giving public school a try."One complaint of Zacharies, when he was at school this year, was 'Mom, I can only eat two times a day?” Bell jokes. “That was really hard for him.”Other factors that went into Bell’s decision were cost, control, safety, and individualized care. The most important? Freedom."Homeschooling is so flexible that you don't have to do it during the hours of 9 and 3,” explains Bell. 770

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