当两边相同时，围绕着中心位置也会一直有轻微的摆动。

When both sides are equal, there is still a slight oscillation around the middle position.

youdao

当两边相同时，围绕着中心位置也会一直有轻微的摆动。

When both sides are equal, there is still a slight oscillation around the middle position.

youdao