| 词汇 | plumb bob | 
| 释义 | plumb bob 1 ENTRIES FOUND: plumb bob (noun) plumb bob noun plural plumb bobs plumb bob noun plural plumb bobs Learner's definition of PLUMB BOB [count] US 1 : a usually small, heavy object that is used to make a string or rope hang straight : the heavy object that is part of a plumb line铅锤 — called also bob 2 : plumb line | 
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