单词：area of propeller disc
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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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