兰州胎儿妊娠发育过程模型（8部件）(山东妊娠骨盆模型（带9月大胎儿）) (今日更新中)

WASHINGTON, D.C. -- New Jersey Sen. Cory Booker has dropped out of the race for the Democratic presidential nomination. Booker made the announcement in a video posted to Twitter, saying "It’s with a full heart that I share this news—I’m suspending my campaign for president." He added, "To my team, supporters, and everyone who gave me a shot—thank you. I am so proud of what we built, and I feel nothing but faith in what we can accomplish together." 463

Watch live: Tune into a live stream of the debate in the video player below. Setting the stageThe first Democratic Party debate for the 2020 election cycle will include a record 20 participants with 10 candidates on stage at once. The debate will be divided between two nights - this Wednesday and Thursday. The debate will be aired on NBC, MSNBC and Telemundo from 9-11 p.m. ET both nights. The debate will be moderated by Savannah Guthrie, Lester Holt, Chuck Todd, Rachel Maddow and José Diaz-Balart. The rulesCandidates will have to talk fast as each candidate will only get 60 seconds to respond to each question and 30 seconds for follow-ups, according to NBC News. The candidates will not be afforded an opening statement, but will be allowed to deliver a closing statement. The candidatesThe Democratic National Committee used both polling and fundraising criteria to extend invitations to this week’s debate. Candidates needed to either have 65,000 donors or have at least 1 percent of the vote in a series of polls. The qualifying candidates were then split into two groups based on polling numbers. From there, the candidates were randomly picked for the two nights. Here is the lineup for Wednesday’s half of the debate: Sen. Cory Booker of New JerseySen. Elizabeth Warren of MassachusettsFormer Rep. Beto O'Rourke of TexasSen. Amy Klobuchar of MinnesotaFormer Rep. John Delaney of MarylandRep. Tulsi Gabbard of HawaiiFormer Housing Secretary Julián CastroRep. Tim Ryan of OhioNew York City Mayor Bill de BlasioWashington Gov. Jay InsleeHere is the lineup for Thursday’s half of the debate:Sen. Bernie Sanders of VermontSen. Kamala Harris of CaliforniaFormer Vice President Joe BidenMayor Pete Buttigieg of South Bend, IndianaSen. Michael Bennet of ColoradoAuthor Marianne WilliamsonRep. Eric Swalwell of CaliforniaSen. Kirsten Gillibrand of New YorkEntrepreneur Andrew YangGov. John Hickenlooper of Colorado.Why such a large field? One reason is many Democrats see an opportunity to win in 2020 with Trump’s disapproval rating consistently above 50 percent, according to Gallup. A second reason is that the DNC has changed its nominating rules, taking power away from so-called “Super Delegates” and allowing the primaries and caucuses to solely decide the party’s nominee. Isn’t this early for a debate?While the Democrats did not hold their first debate until 13 months before the general election in 2016 (there are still 16 months between now and the 2020 general election), that was relatively late. In 2008, the Democrats held their first debate more than 18 months before the general election. The Republicans held their first debate in 2016 less than 15 months before the election. In 2012, the GOP had its first debate 18 months out from the general election. In that case, it might have been a case of being too early. The May 2012 debate did not draw eventual nominee Mitt Romney to the stage. What the polls say?Like the Republicans in 2016, the Democrats have such a large field, all of the candidates could not fit on one stage. Unlike the Republicans, the Democrats opted to divide candidates between two debates at random rather than holding an “undercard” debate. But if polling is any indication, Thursday has the stronger candidates. Four of the top five candidates will be on the stage on Thursday, according to last week’s poll released by Mammoth University. Frontrunner Joe Biden along with Sen. Kamala Harris, Sen. Bernie Sanders and Mayor Pete Buttigieg will share a stage Thursday. Sen. Elizabeth Warren is the only candidate among the top 5 who will be on stage Wednesday. What will be discussed?President Donald Trump, obviously. A Mommouth University poll from February showed that electability is a strong consideration for Democrats. Of those surveyed, 56 percent of Democrats said that they would prefer a candidate who could beat Trump rather than a candidate they would agree with. Just 33 percent said the opposite. With that in mind, it is safe to say some candidates will go after Trump rather than trying to win points with policy. That doesn’t mean Democrats on the stage won’t be challenged. Will Biden be challenged on his comments about working with senators who supported segregation? Will Buttigieg be asked about his handling of a recent police-involved shooting in South Bend, Ind? What about Sanders’ plan to erase student loan debt in the US? These are all likely questions to come up. When are the primaries and caucuses?The first caucus is in Iowa on February 3. The first primary is eight days later. Arguably the most important day will be March 3 when at least 14 states are slated to vote. 4668

WASHINGTON, D.C. — He’s a 250-pound four-year-old, heading for his homeland.For more than a week now, crowds have gathered at the National Zoo in Washington, D.C., to say bye-bye to Bei Bei.“He's captured our hearts for over four years and we want to say thank you for all the joy, smiles, happiness, laughter he's given us,” said Gena Kim, who flew in all the way from Los Angeles to see Bei Bei one last time.Bei Bei — a name that means “precious treasure” in Mandarin Chinese — embarked on a 16-hour flight back to China on Tuesday. It is part of an agreement between the zoo and the Chinese government. It’s something the panda keepers knew would happen one day, but still find tough to face.“There's the very professional side of me that's known from the moment he was born, per the loan agreement, that he has to return to China,” said National Zoo panda keeper Marty Dearie. “But the personal side of me, I know he's one of my favorite animals I've ever worked with.”Pandas in zoos around the world are — for all intents and purposes — on loan from China. The agreement between the National Zoo and China is part of a conservation program designed to save the giant panda, listed as "vulnerable" in the wild by the International Union for Conservation of Nature. The pandas are sent back to China to be reintroduced to the wild. In Washington, Bei Bei’s parents will stay for now. Their agreements are up next year.“They are on loan with us through December of next year, at which point there will be a renegotiation about what we're doing with those guys,” Dearie said.Other than the National Zoo, only two others in the U.S. have pandas: Atlanta and Memphis. The San Diego zoo’s pandas had to be returned to China in April when their agreement was not renewed by the Chinese government. Zoo officials there said the contract was up and the panda’s return had nothing to do with U.S.-China tensions over trade and tariffs.Back in the nation’s capital, panda fans hope Bei Bei’s parents, Mei Xiang and Tian Tian, get to stay in D.C. for years to come.“We're so attached to Mei Xiang and Tian Tian,” Kim said. “We really wish that they can stay longer here in Washington, D.C. because they're the power couple in D.C.”They are a power couple in a town that can, at times, be panda-monium. 2311

UPDATE (2 PM EASTERN, WASHINGTON, D.C.): President Donald Trump and Vice President Mike Pence spoke to the media following the leaders of the Democratic Party speaking to the media Friday. The speeches were made after they all met regarding the current government shutdown.President Trump said the meeting was positive, and progress was made. He will have a group focused on the shutdown talks over the weekend.Trump went on to talk about issues at the U.S.-Mexico border, talking about someone who was shot and killed at the border and said "we don't want that happening." He said the ports of entry have great security but there is fencing and walls that stop because proper border security is still needed.People illegally entering the country go to the weakest and most unprotected parts of the border, the President explained.Children are hurt more than anyone else because of open borders, Trump said. They are the victims of people bringing them through unsafe areas, and are susceptible to attacks by coyotes.There is a lot of open space, he said he told Pelosi, Schumer and the other leaders he met with Friday.EARLIER STORY:A meeting Friday between President Donald Trump and newly powerful Democrats ended in continued stalemate as a partial government shutdown wears on. 1294

Walmart will begin taking the temperature of its employees prior to their shifts in the hopes of preventing the spread of the novel coronavirus, the company said in a press release on Monday.According to the press release, the company is in the process of sending digital thermometers to all of its store locations, which could take up to three weeks. Once the thermometers arrive, all employees will have their temperature taken before every shift. Those who have fevers of over 100 will be paid for the day and sent home. Any employees with a fever have been asked not to return to work until they go three straight days without a fever of over 100.Walmart said it would also supply gloves and masks to employees who want them. The store says the equipment will arrive at stores within a week or two, and that they would continue to provide them to employees while supplies last.The store also encouraged employees to stay six feet away from others while working and wash their hands frequently with soap for 20 seconds.Previously, Walmart 1054

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