If their population is tracked through time, it will be seen to be particularly unstable—soaring and plummeting in irregular cycles.

如果对它们的数量进行时间记录，就会发现它是很不稳定的——以不规则的周期急剧上升下降。

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It is thanks to an ageing population and soaring health and pension costs that America's debt ratio will still be rising in a decade.

在美国，归因于其老化的人口以及飙升的健保及退休金成本，债务比率在未来十年仍将继续攀高。

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Central bankers may hope that soaring oil and food prices will prove to be just a blip, and will not result in secondary effects such as higher wages.

央行兴许希望飞涨的石油和食物价格将证明只是个信号但不会引发如提高工资这样的次级效应。

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