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backsight ['bæksaɪt] n
gen. 后视读数,表尺; 表尺缺口; 标明已测位置的小旗〔记号〕; 反觇
archit. 后视读数
hydroel.st. 后视
oil 回视; 瞄准孔
space 向后瞄准; 后视标尺
tech. 瞄准口
backsight: 3 phrases in 1 subject
Technology3