noun, verb, punctuation, preposition, particle, directional · gate, door, gateway, or opening

请你在离开办公室之前记得把所有的窗户和门都关好。

measure word, noun · classifier for large guns, lessons, subjects, or branches of technology

我这学期选了五门课。

noun · class, category, phylum, or division in taxonomy

脊索动物门是动物界最高级的门。

measure word · way to do something; a knack or trick

要想学好这门手艺，必须得先入其门。

place name, verb · family, house, religious sect, or school of thought

虽然他们两人现在是对手，但其实本是同门。

noun · valve, switch, or mechanical opening

司机猛踩了一脚油门，车子飞快地冲了出去。

proper name · surname Men

门先生是这家公司的经理。

noun, punctuation · suffix used for scandals, derived from the Watergate scandal

这起泄密事件演变成了该国的“邮件门”。