n. 起伏现象；变动；波动（fluctuation的复数）

n a wave motion
n an instance of change; the rate or magnitude of change
n the quality of being unsteady and subject to changes

fluctuations的用法和样例：

例句

用作名词(n.)

Fluctuations are spatial and temporal in character.这种波动的特点是空间性和瞬时性的。
Turbulence or gusts produce velocity fluctuations.紊乱性或阵息性使速度产生波动。

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