To supporters, GM crops are a key part of the effort to sustainably provide food to meet a growing global population.

为满足日益增长的全球人口需求，需要付出努力，持续地提供粮食。对于支持者来说，转基因作物是这一努力的一个关键部分。

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The tourist increase is one key reason the city's population is down from 175,000 in the 1950s.

游客人数的增加是该市人口从20世纪50年代的17.5万人下降到目前人数的一个关键原因。

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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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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

He said it will not be possible to protect the Afghan population -- the key to any counterinsurgency strategy -- without a substantial input of additional resources.

CNN: Adviser: At least 25,000 more troops needed

Two are key: population and wealth.

ECONOMIST: s predict the medal tally