单词：low-noise propeller
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Noisy Ships Have Whales Yelling to be Heard Ferries, freighters and fishing and tour boats are part of the tableau that often makes living by the sea postcard-pretty and desirable. But all that maritime activity creates cacophony underwater - and has
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Finally, the long-awaited flying car is almost here. 终于，人们期待已久的飞行汽车就要面世了。 AeroMobil, a Slovakian company, plans to start selling its creation, the AeroMobil 3.0, in 2017. 斯洛伐克公司AeroMobil计划在201
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