The guards checked at the peephole before entering.卫兵进入前透过门镜检查了一下。I have a security peephole in my front door.我家前门上有个防盗窥视孔。The guards checked at the peephole before entering.卫兵进门前透过猫眼检查了一下。I always look through the peephole before I open the door for anyone.我开门前总是通过窥视孔看看是谁。