Gradually actions come to play important roles and what may have seemed insignificant at one moment can trigger a pendulum of results.

循序渐进的行动越来越重要，那些看起来一时无关紧要的时刻也会产生与众不同的结果。

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And so all we have to do now is to calculate the moment of inertia of the system, and then we can predict what the period — of this pendulum is going to be — which is not my goal.

所以我们现在要做的，是算出这个系统里的转动惯量，然后就可以预测出，这个摆的周期是多少-，这并不是我的目的。

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The structure principle of three line pendulum can be used to measure the moment of inertia of small missiles, submunition, aeroplane model and other structural members.

利用三线摆的结构原理可以测量小型弹箭、子弹头、飞机模型及其他构件的惯性矩。

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