单词：tour de force
tour de force的用法和样例：
例句
- Work is equal to force times the distance through which the force acts.功等于力乘上力作用所通过的距离。
- Until then, physicists had postulated boundary conditions in which no force acted on the ends of the strings, leaving them free to flap around.当时，物理学家早已假定了没有力作用在弦两端的边界条件，让弦的末端可以自由摆动。
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