So watch out for the signs: beware false friends, whilst at the same time doubling your appreciation of those who prove themselves true.

因此，我们要注意这些迹象，警惕那些假冒的朋友，同时，也要双倍珍惜那些真正的友人。

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Some will be growing very rapidly, some will be growing less rapidly, and what this equation shows you here or that rate of growth the to the doubling time of cells.

有些会生长得更快些,有的慢一些,而这个方程告诉你,即生长的速率和细胞倍增的时间联系起来

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Hansen suggested that a 10-year doubling time was plausible, pointing out that such a doubling time from a base of 1 mm per year ice sheet contribution to sea level in the decade 2005-2015 would lead to a cumulative 5-metre sea-level rise by 2095.

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What value can this limited time, or even a doubling of this time, produce?

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In a non-linear problem, the most relevant number for projecting sea level rise is the doubling time for the rate of mass loss.

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