英文英文字典
英文英文字典
古腾堡计划中的在线英语-英语词典
结果
Backsight的结果
Backsight
(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.