Fluctuating
v. 波动（fluctuate的ing形式）
✅ 同义词
🔴 反义词
🗣️ 情景例句
And if you ever need Dad or me to help you ...
如果你们的确需要我和爸爸的帮助的话 ……
No practice, no gain in one's wit.
吃一堑，长一智。
The doctor began to operate on the boy.
医生开始给那个男孩动手术。