The H5N1 virus is not stable and keeps constantly changing.

H5N1型病毒不稳定并不断变化。

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"The brain's ability to learn information is not stable across the day," Walker tells WebMD.

沃克告诉网络医生说：“在一整天里，脑学习信息的能力不是稳定的。”

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Donors admit that what works in poor, stable countries probably won't in those which are not poor and not stable.

援助国承认那些在贫穷且稳定的地区行得通的方案在那些不贫穷却不稳定的地区可能行不通。

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These are countries which are not stable politically." "The Georgians,particularly, need serious military reforms before they'll come up to NATO standards.

VOA: standard.2009.09.04

Or vaccines that could be transported more easily— the hepatitis vaccine that we get is not stable unless it's refrigerated.

或者令疫苗更易于运输,现在的肝炎疫苗一定要冷藏,否则它就不稳定

耶鲁公开课 - 生物医学工程探索课程节选

The other is that some places where the disease occurs the governments are not stable, or there might be civil unrest or civil wars and that makes it very difficult to orchestrate giving vaccines when there's other things happening in the country that are of more immediate concern.

另一个原因是,一些疾病发生地区,当地的政局不那么稳定,或者有动乱和内战,当在一个国家内发生许多,突发应急事件的时候,疫苗的分派发放会变得非常困难

耶鲁公开课 - 生物医学工程探索课程节选

Compared to the major global currencies, the dollar remains relatively mixed, if not stable.

FORBES: Dollar Falls Apart In Brazil

And whatever the true relationship between Russia and Europe may prove to be, it is not stable yet.

ECONOMIST: Alexander Lukashenka, Europe��s odd man out

Donors admit that what works in poor, stable countries probably won't in those which are not poor and not stable.

ECONOMIST: Wealth, poverty and fragile states