Older people must be given more chances to learn if they are to contribute to society rather than be a financial burden, according to a new study on population published recently.

根据最近发表的一项关于人口的研究，如果老年人要对社会作出贡献而不是成为经济负担，就必须给他们更多学习机会。

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Consequently, the survival rate of lobster larvae must be going up, and the lobster population in Foerkland's coastal waters is bound to increase.

因此，龙虾幼虫的存活率必然会提高，而福岛沿岸水域的龙虾数量也必然会增加。

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However, it must be stressed that public health authorities must always balance the health risk to the population against other undesirable consequences.

然而，必须要强调的一点是，公共卫生主管当局必须始终权衡人口卫生风险和其它不良后果。

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The required cell population that must be targeted (killed or controlled) to cure or control cancer, is the set of all malignant cells that could evolve.

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The men agree on almost everything: They don't want a sectarian rift in Syria, they don't want foreign jihadist fighters entering the country, and they say government thugs must be stopped from harassing the population here.

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That's nearly half the population, who must be resettled before the winter rainy season if they are to plant the single annual rice crop.

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