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n. 树液, 体液, 活力, 坑道, 消弱, 警棍
vt. 使排出体液, 使伤元气, 使衰竭, 挖坑道逼近, 逐渐侵蚀
vi. 挖坑道, 消弱
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n. a watery solution of sugars, salts, and minerals that circulates through the vascular system of a plant
v. excavate the earth beneath

过去分词: sapped 过去式: sapped 现在分词: sapping 第三人称单数: saps 复数: saps