Mathematical models have also revealed that food webs may be unstable, where small changes of top predators can lead to big effects throughout entire ecosystems.

数学模型也揭示了食物网可能是不稳定的，顶级肉食性动物的微小改变会对整个生态系统产生巨大影响。

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They could be said to be unstable.

他们可说是不稳定的。

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Even in fair weather, however, supplies can be unstable.

即使天气好的时候，食盐供应也不稳定。

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The group says unstable countries damaged by war and ongoing conflict continue to be those most affected by corruption.

VOA: special.2009.11.28

These are elements that have yet to be isolated These are elements that are unstable.

这些元素还没有被提取出来,这些元素很不稳定。

麻省理工公开课 - 固态化学导论课程节选

"In areas where the sleeping sickness is still very prevalent, such as remote areas of some central African countries -- which are by the way very unstable areas -- it will be also crucial to have simpler treatment and obviously oral treatment would be the best."

VOA: special.2010.04.07

People are afraid to go into the field because the see the funding might be unstable.

FORBES: Magazine Article

He may try to operate a minority government but that will clearly be unstable.

BBC: Stalemate in 'ungovernable' Italy after elections

In the early years the euro money supply is therefore likely to be unstable.

ECONOMIST: Remember monetarism? It may be coming back into fashion