Floating population is a key population for HIV prevention.

流动人口是预防艾滋病的重点人群。

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When wolves later reached the island, naturalists widely assumed that the wolves would play a key role in controlling the moose population.

博物学家们普遍认为，当狼群之后抵达该岛时，它们将在控制驼鹿数量方面发挥关键作用。

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Two are key: population and wealth.

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With population a key influence on the environment, UNFPA says the 1994 Cairo conference on population and development linked environmental protection to individual decision-making and human rights.

BBC: 'Shortsighted' world lets population swell

Another key trait marking the population's distinctive cultural identity is the use of an English-based creole vernacular known as Gullah.

CNN: African slave traditions live on in U.S.