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The surveyors set up their plumb-bobs to ensure each post was perfectly vertical.
See correct answer
The surveyors set up their plumb-bobs to ensure each post was perfectly vertical.
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Related words
plumb-bobs
Noun
form-of
plural
Japanese Meaning
「plumb-bobs」は「plumb-bob」の複数形で、鉛直（真下）を測定するために用いられる重り、またはその器具を指します。
English - English
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