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单词 θ7431
释义
the world > the earth > earth sciences > geography > map-making > surveying > [noun] > surveying instruments > chain > arrow used to guide a measuring chain (2)
arrow1600

Surveying. A metal or metal-tipped rod placed in the ground by a surveyor to mark each chain length; = chain-pin n. at chain, n. compounds 3. Cf…

broach1600

A surveyor's arrow used with the chain. Obsolete.

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