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能够通过小孔观察外部的小型光学仪器 来自维基百科,自由的百科全书
门镜又称猫眼、防盜眼、防盜鏡,是一种能够通过小孔观察外部的小型光学仪器。安装在房门上,使得屋内的人无需开门就可以观察到屋外的情况,从而保证自身的安全。
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.