tautochrone的翻译，读音
英/'tɔ:tәkrәun/
释义：
n. [数]等时曲线,等时降落轨迹
n. 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.
n. 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.