fall off
柯林斯词典
1. PHRASAL VERB If something falls off, it separates from the thing to which it was attached and moves toward the ground. 脱落
When your exhaust pipe falls off, you have to replace it. 当你的排气管脱落时,你只能更换它。
2. PHRASAL VERB If the degree, amount, or size of something falls off, it decreases. 降低; 减小
Unemployment is rising again and retail buying has fallen off. 失业率又在上升,而零售购买量已经减少。
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