DICT.TW Dictionary Taiwan

 tautochrone
 等時降落軌跡; 等時曲線

 Tau·to·chrone n.  Math. A curved line, such that a heavy body, descending along it by the action of gravity, will always arrive at the lowest point in the same time, wherever in the curve it may begin to fall; as, an inverted cycloid with its base horizontal is a tautochrone.
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