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index glass
archit. 测角器指示镜; 六分仪的动镜
met. 标镜; 刻度玻璃
tech. 指镜; 指示镜; 测角器的指示镜; 六分仪动镜; 动镜; 分度镜
index glass: 12 phrases in 1 subject
Technology12