roof plummet顶点对点器
plummet to骤降至
lead plummet铅垂球;垂球
Method plummet锤测法
Plummet Fittings铅锤配件包
plummet popularity垂直落下
Penguin Plummet企鹅跳水
laser plummet激光垂准仪;激光对点器;雷射垂准仪
V-I（不及物动词） If an amount, rate, or price plummets, it decreases quickly by a large amount. (数量、比率、价格) 暴跌 [journalism]
In Tokyo share prices have plummeted for the sixth successive day.
在东京，股价已经是连续第6天暴跌了。