peephole
柯林斯词典
1. N-COUNT A peephole is small hole in a door or wall through which you can look secretly at what is happening on the other side. (门或墙上的)窥视孔
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1. N-COUNT A peephole is small hole in a door or wall through which you can look secretly at what is happening on the other side. (门或墙上的)窥视孔