But conditions might not be sufficient to ensure the long-term survival of polar-bear prey, such as ring seals.

但是，这对于北极熊及其食物链上的物种——比如海豹而言，却并不是长久的生存之计。

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THEY rarely ring a bell at the bottom of bear markets.

熊市的底部几乎总是悄无声息地来临。

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As is shown in the picture, the shortest board decides the capacity of the wooden barrel, and the broken ring makes the iron chain bear the weight that it should have done becoming impossible.

简要描述图画表面信息，作者采用的写作方法是翻译了图片左下角的中文提示语——一只木桶，最短的一片决定其容量；一根铁链，最脆弱的一环决定其强度。

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