Removing the mud, uncovering gravel beds where fish spawn, and finding suitable salmon types to rebuild the population is a daunting task.

清除淤泥，发现鱼类产卵的砾石层，找到合适的鲑鱼种类来重建种群是一项艰巨的任务。

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The authors suggest further research is needed to confirm and generalize their findings to the wider population and to other types of music.

作者指出证实和总结对更广人口和其他类型音乐的发现的进一步研究是必要的。

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About 4% of the population has “amusia” of one sort or another, and at least some types of amusia are known to be heritable.

约4%人口患有各种程度的“失歌症”，并且我们已经知道至少某些失歌症具有遗传性。

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Perhaps the biggest obstacle to the buy-local movement, said Yonkers, is our nation's deep reliance on an industrial agricultural system, and a population accustomed to having all types of food available at all times, no matter what the season.

CNN: 'Farm fresh' movement a growing food trend

Its deadliness was linked, among other things, to the weakness of buildings, the depth of the quake, the density of population, the fault and soil types, and the intensity of the shaking.

ECONOMIST: Why the Kashmir earthquake happened and what might be done

Although people in every population come in all shapes and sizes, body types and physiological characteristics follow a Gaussian distribution curve as a result of evolutionary adaptations by our ancestors to extremely varied environmental challenges.

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