plumb-bob float铅锤式浮标
Gage plumb-bob垂球水尺
plumb-bob plummet测锤
plumb-bob vertica铅垂垂线
plumb-bob effect铅锤效应
plumb-bob vertical[测] [地物] 铅垂垂线
plumb plumb bob plummet铅锤
plumb-bob测锤;水晶
Plumb-bob line锤线
N（名词） the weight, usually of lead, at the end of a plumb line; plummet 铅垂