oscillation
/ˌɔsɪˈleɪʃn; ˌɑsl`eʃən/ n
(fml 文)
1 [U] action of oscillating or being oscillated 摆动; 动摇; 振荡
the oscillation of the compass needle 罗盘指针的摆动
the oscillation of radio waves 无线电波的振荡.
2 [C] single swing or movement of a thing or person that is oscillating （物或人的）一次摆动, 动摇
Her oscillations in mood are maddening. 她喜怒无常能把人气疯.