There are plenty of places around the globe where people have no access to heavy machinery but do know how to deal with wind, sailing and basic mechanical principles.
在世界上有很多地方,人们都无法使用重型机械,但却知道如何处理风力、航行和基本的机械原理。
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They thought that if the Earth itself was moving, there would have to be a constant wind blowing, sweeping them off their feet, and of course there wasn't.