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华盛顿领空遭无人机入侵 空域安全存在漏洞 When Florida Postal Service worker Doug Hughes landed his homemade gyrocopter on the west lawn of the U.S. Capitol, in a daring bid to deliver a political message to the lawmakers, the securi
Keeping Washington DC Airspace Safe Is Tall Order 保持华盛顿领空安全是艰巨的任务 WASHINGTON Being the home of all three branches of the U.S. federal government makes Washington, D.C., the prime target for those who want to make their m
保持华盛顿领空安全并非易事 Being the home of all three branches of the U.S. federal government makes Washington, D.C., the prime target for those who want to make their messages and ideas heard. Unfortunately, many of them choose to deli
Major world automakers have already invested heavily in electric vehicles and related technology and they are committed to keep doing so. Some have even promised to stop producing vehicles that run only on gas or diesel fuel in the future. The change
The Wheel 轮子 You probably see wheels underneath cars, airplanes, bikes and many other vehicles. 你可能看到过汽车、飞机、自行车和很多其他交通工具底下的轮子。 A wheel is a kind of machine. 轮子是一种机器。 It i
SHANGHAI, Jan. 23 (Xinhua) -- Shanghai resident Qian Jun didn't have to spend a single penny on a license plate for his newly-bought battery electric vehicle (BEV). The electric car cost him 140,000 yuan (22,498 U.S. dollars) in total, including a ve