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Sometimes it is because in the new population, the genetic background for their other genes masks the effect of gene a on depression.

有时，那是因为在新的人群中，人们其他的基因作用下的遗传背景掩盖了基因A对抑郁的效应。

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Feeding a world population approaching seven billion against a background of growing concern over our planet's capacity to adapt to a changing climate is a tall order.

在地球的承载力如何适应全球气候变化的背景下，养活接近70亿的世界人口是一项难以完成的工作。

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Similarly, although 45% of the population is from a Catholic background, only 25% describe themselves as Irish.

BBC: Northern Ireland has 'most difficult year' in decade

North Wales Police said it was on target to reach the 2009 deadline for recruiting the number of officers, which reflect the region's working population from an ethnic minority background.

BBC: NEWS | UK | Wales | North West Wales | Force anti-racism efforts praised

Finally, we have so far concentrated all our efforts where we knew the problem was worse - London, where at one time almost a quarter of the homeless population had an ex-forces background.

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