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F stop
photo.	光圈的 F 指数; 光阑刻度标记值=焦距/透镜的有效直径
f-stop
adv.	光圈系数
cartogr.	f 光阑
space	f 制光圈; f光阑
F-stop
gen.	光圈的 F指数; 光阑刻度; 标记值焦距/透镜有效直径
f stop
adv.	f 制光圈