The swing doors had moved in diminishing pendulum movement, and now there was nothing but molecular reverberation, one step up from the imaginary.

弹簧门的摇摆幅度慢慢减小了，从假想的层面上更进一步，现在空气中只剩下了四下回荡的分子运动。

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The ideal simple pendulum movement is not practical though it is simple, and the practical case comes from the correction and improvement of the ideal case.

理想的单摆运动虽然简单却不实际，实际情况需要在理想情况的基础上进行修正和改进。

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As an approximate method, with the trigonometric function, the simple pendulum dynamical equation is simplified, and the approximate formula for the period of simple pendulum movement is presented.

利用三角函数作为一种近似方法，对单摆的动力学方程进行了简化，给出了大角度条件下单摆运动的周期的近似公式。

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The market will always exhibit a pendulum type movement, alternating between gains and losses, simply due to fear, greed, and the financial unknown.

FORBES: Making Volatility Work For You

It may be that a kind of pendulum is built into American politics: if the gun lobby or the anti-affirmative-action movement scores a victory, its supporters grow complacent and its adversaries redouble their efforts, so that the victory is soon reversed.

ECONOMIST: Why are these Republicans smiling?