This morning the sky is grey and it is drizzling. It may well clear up because when it rains here it usually does not last for long.

今天早上天空灰蒙蒙的下着毛毛雨，很快会转晴的，因为这里下雨的时候通常不会延续很长时间。

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However, this usually does not last for long. This is an important lesson for us:we can solve a problem(problem), bylearning to forget.

但是，这种不友好通常不会持续很久。这对我们来说是个重要的教训：我们可以通过学会忘记来解决一个问题。

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But given the effects on cloud formation and dissipation (a cloud laced with black carbon does not last as long) the potential for error in estimating the final effects is large.

考虑到云的聚集和散开（由炭黑聚集的云并不会持续很久），最终结果可能会存在很大的错误。

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Observers predict that even if Mr Netanyahu does manage to cobble together a coalition it will not last for long, given the wide differences between its likely elements over important questions of policy.

ECONOMIST: Israel