fluctuate

v. /ˈflʌktʃueɪt/ C2

波动；起伏不定

To change continually and irregularly up and down.

仙境例句

All through her adventures, Alice's size would fluctuate, now as tall as a tree, now tiny as a mouse.

在整个冒险中，爱丽丝的个子忽高忽低，一会儿像树那么高，一会儿像老鼠那么小。