Imagine that you have a pendulum in outer space, that there is no gravity, nothing.
加上在外太空，有一个钟摆，那里没有重力，没有。
Mono-pendulum experiment is used to measure local weight acceleration of gravity.
单摆实验是用来测量当地重力加速度的。
Mono-pendulum experiment is used to measure local weight acceleration of gravity.
单摆实验是用来测量当地重力加速度的。
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