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单词 plummet
释义 plummet/ˈplʌmit/ n. & v.n. 1 a plumb or plumb line 铅锤;铅垂线 2 a sounding line 测深线 3 a weight attached to a fishing line to keep the float upright (钓丝上的)坠子,铅坠(用以使鱼漂竖起) v. intr. (plummeted, plummeting) fall or plunge rapidly 快速落下;垂直落下 [Middle English from Old French plommet, diminutive of plomb (as PLUMB1)]
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