backsight
'bæksait
基本解释
n. 后视, 表尺缺口
英文释义
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.
上一个单词：backsides
下一个单词：backsiphonage