He decided to study how mangrove forests benefit humanity, but needed an accurate estimate of how much remains.

他决定研究红树林对人类的有益之处，但首先必须得到当下红树林的精确数据。

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To study why this is so, Rufus Johnstone of the University of Cambridge used computer models to estimate the benefit of helping groupmates.

为了研究原因，剑桥大学鲁弗斯•约翰斯通利用计算机模型预测抚养后代的益处。

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So far, between 6, 000 and 12, 000 Londoners have been taught to swim, and we estimate that up to 250, 000 Londoners will benefit from extra sports training facilities of other kinds, too.

迄今为止，大约有六千至一万二千名伦敦人学会了游泳。我们预计，多达二十五万名伦敦人将受益于其他类型的体育锻炼设施。

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"As the demand for same-sex marriage is uncertain, and because these economic benefits are not guaranteed to be additional (for example, the spending on a civil partnership or marriage ceremony may not be additional if the couple and guests cut back on spending in other areas), we use zero benefit as our best estimate, " it explains.

BBC: Gay marriage: Eight things for better, for worse

If this benefit is greater than a plausible estimate of the efficiency savings from the merger, then it should be halted.

ECONOMIST: Economics focus

Their work supported the low-end estimate of a net benefit from immigration of about one quarter of 1% of national income.

CNN: What's the value of immigration?