很长的时间以来，城市是唯一的人群的大集合体，因此你可以交换地使用这两个概念。
For a long time cities were the only large collections of people, so you could use the two ideas interchangeably.
细雨才停，灰色天空下黑压压的人群都集合在这里看这一幕戏剧。
Under the grey heavens, whose drizzle just kept off, the dark concourse gathered to see the show.
当手势集合成为一种语言，它就是一种文化，沟通的是不同地域、不同民族的人群。
When collections become a sign language, it is a kind of culture, communication is the different regions, different ethnic groups.
庆祝印度胡里节的人群，穿着着粉红与白色的衣服集合着去印度北部北方邦的维伦达文看一场演出。
Clad in shades of pink and white, celebrants of the Indian festival of Holi gather to watch a play in Vrindavan in the northern Indian state of Uttar Pradesh.
庆祝印度胡里节的人群，穿着着粉红与白色的衣服集合着去印度北部北方邦的维伦达文看一场演出。
Clad in shades of pink and white, celebrants of the Indian festival of Holi gather to watch a play in Vrindavan in the northern Indian state of Uttar Pradesh.
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