peephole

peephole汉语翻译：
n. 窥视孔
【化】窥孔; 观测孔英语解释：
名词 peephole:

a hole (in a door or an oven etc) through which you can peep同义词：spyhole, eyehole

详细解释：
peep.hole
n.（名词）
A small hole or crevice through which one may peep.Also called eyehole
窥孔：一个人们可以用来 * 的小孔或裂缝也作 eyehole