The ancients experienced the sun rising and setting every day, for instance, but did not know the earth was moving around the sun.
譬如，古代人经历了每天的日出和日落，却不知道地球在绕着太阳转。
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.
他们认为，如果地球在运动的话，那么就会有风不断吹来，把他们刮倒——当然了，这种风并不存在。
well the way it was done was develop by an Alexandrian Allen , very famous , he had the sun moving around the earth and Venus orbiting around the point on the line between the earth and the sun.
著名的亚历山大艾伦将这个问题予以阐述，他提出太阳绕着地球转,金星则绕着地球和太阳之间轨道进行圆周运动。
Most of the digging, moving and compressing of earth was done by machines.
挖土、运土和打夯工作大部分用机器进行。
Until now, however, no one was sure if the rumbling calls were also moving through the Earth as seismic waves, possibly helping elephants communicate when there is too much noise above ground.
然而，之前谁也不曾料到“交谈”会像地震波一样地表传播。当地面噪音过大时，大象们很有用交流。
Until now, however, no one was sure if the rumbling calls were also moving through the Earth as seismic waves, possibly helping elephants communicate when there is too much noise above ground.
然而，之前谁也不曾料到“交谈”会像地震波一样地表传播。当地面噪音过大时，大象们很有用交流。
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