backsight

/'bæksait/

n. 后视, 表尺缺口

n. 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.

今日更新

更新时间：2025-06-30 11:06:07