Sap means to gradually weaken or destroy the strength or vitality of someone. It can also refer to tree sap or digging trenches underground.
Sap 的意思是竭尽某人的精力或生命力。它也可能指树液，或在地下挖掘战壕。
| 正面 | sap |
|---|---|
| 背面 | vt. 使衰竭，使伤元气 n. [植] 树液；精力，元气；活力；，地下战壕，坑道 |
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