这些跌宕起伏的变化迫使我们的祖先学会及时适应变化;大脑发达的人类可能是在一个不稳定的环境中幸存下来。
These ups and downs might have forced our ancestors to adapt quickly; big-brained humans may have had a survival edge in an unstable environment.
希腊自身公共财政所存在的不稳定性可以解释希腊国债收益的起伏，但奇怪的是这一可能的解释却被忽略了。
The possibility that gyrations in Greek bond yields could be explained by uncertainty about its public finances is, oddly, ignored.
从外观来看，纪念碑群由2711根长短不一的灰色碑柱组成，从远处望去，黑灰色的石碑如同一片波涛起伏的石林，让游客不由自主产生一种不稳定的、迷失方向的感觉。
From outside, the 2, 711 dark gray slabs form a gentle wave, ankle-high in some places, designed to give visitors a sense of instability, a loss of orientation.
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