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DHAKA -- Chinese-built factory has begun manufacturing concrete sleepers for a mega rail link project in Bangladesh connecting to the country's largest Padma bridge which was also being constructed by Chinese firms.

Dai Hong, director of the ophthalmology department at Beijing Hospital, said that RVO is a blinding retinal eye disease which develops rapidly. If not treated in time, over 90 percent of the central retinal vein occlusion patients' final visual acuity will be lower than 0.1, causing blindness.

Daniel Buchmueller, a co-founder of Amazon Prime Air who is now director of engineering at Flatiron Health, is listed as a key inventor for the tether patent, which was filed in 2015, as well as for the adjustable drone, which was the subject of a 2014 patent application.

Data from Beijing-based research firm Openbook showed online book sales grew 24.9 percent year-on-year to reach 71.51 billion yuan in 2019, while sales among bookstores fell 4.24 percent to about 30.76 billion yuan.

DHL transport vehicles stand ready to be loaded in front of the company's logistics center in Gross Schwass near Rostock, northeastern Germany. [Photo/Agencies]