... 逆转轴 inversion axis 反转中心 inversion center 反演＜翻转＞分叉（*光谱谱条） inversion doubling ...
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Inverson of circle: Into a circle, if the circle pass through inversion center o, it becomes a straight line.
圆的反演：反演成一圆。但当圆通过反演中心时变成一直线。
Based on the mass-period method, a measuring device named double spring inversion pendulum was designed, which could measure the center of mass and moment of inertia of an engine.
基于振动系统质量周期法，设计了一种测试发动机质量参数的双簧倒立摆试验台。
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