You can experiment with it if you wish; and perhaps you can find out how long a pendulum must be to vibrate once in two seconds.
假如愿意的话，你可以用它来做试验，也许你就会算出，钟摆每两秒钟摆动一次的摆长应该是多少。
You can experiment with it if you wish; and perhaps you can find out how long a pendulum must be to vibrate once in two seconds.
假如愿意的话，你可以用它来做试验，也许你就会算出，钟摆每两秒钟摆动一次的摆长应该是多少。
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