It's necessary to wear the mask in the groups of people.

在人群中戴口罩是必要的。

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Some groups of people are more vulnerable to the illness.

一些人群更容易感染这种疾病。

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In eighteen ninety-seven,the word came to mean the huge groups of people running or stampeding to Alaska and the Klondike.

VOA: special.2009.02.04

There are groups of people who have studied the impact of Trans fats on health for a number of years.

有些人已对反式脂肪,对健康的影响进行了数年的研究

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So I had a lot of experience with groups and working with different types of people

所以关于团队合作，与不同的人打交道这方面，我还是很有经验的。

在模拟审判课堂 - SpeakingMax英语口语达人

As a society, we have come to rely on labels to categorize certain groups of people.

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Those are great convening groups of people who give us a lot of help.

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Much like the family structure, workplaces assemble groups of people with established hierarchies and identified skills.

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