老式风车能杀死鸟类是因为它们旋转得很快。
这种装置就像水下风车一样，叶片随流过的潮汐旋转。
These devices act like underwater windmills, with blades that rotate as the tide flows through them.
每秒几百公里的旋转速度可能使圆盘里的物质呈现象宇宙玩具风车一样独特的螺旋形。
This spinning motion, at speeds of hundreds of kilometers per second, may cause matter in the disk to take on a distinctive spiral shape like a cosmic pinwheel.
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