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backsight n. 后視,表尺 後視,表尺 Backsight \Back"sight`\ (b[a^]k"s[imac]t`), n. [Back, adv.
sight.] (Surv.) The reading of the leveling staff in its unchanged position when the leveling instrument has been taken to a new position; a sight directed backwards to a station previously occupied. Cf. {Foresight}, n., 3. [1913 Webster]
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