oscillation

n. /ˌɑː.səˈleɪ.ʃən/ C1

振动；摆动；摇摆

A repeated movement back and forth around a central point.

仙境例句

Reeling lessons were all about oscillation: rocking forward and back without falling over.

“摇摆”课学的就是来回摆动：前后摇晃，却不能摔倒。