plumb bob [测] 铅锤 ; [建] 垂球 ; [建] 测锤 ; 锤球
brass plumb bob 钢吊线锤
gauge plumb bob 量油尺铅锤
Laser Plumb Bob 镭射测锤 ; 激光测锤
plumb-bob effect 铅锤效应
setting-out of side plumb bob 边垂线标定
plumb bob holder 垂球架
N the weight, usually of lead, at the end of a plumb line; plummet 铅垂
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