Telling such stories to two year olds does not seem to produce long-lasting verbalizable memories.

给两岁的孩子讲这些故事似乎并不能使他们形成可以用语言表达的持久性记忆。

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However, the weight gain was not permanent in every case, lasting only long enough for the infected person to build up resistance to the virus.

然而，这种原因的体重的增加都不是永久的，它只会持续到感染者有能力足以抵抗该病毒为止。

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These sources of positive news feed their motivation at the time, but this motivation does not always last long enough to bring lasting change to their lives.

这些积极信息源的确可以在某些时候给予我们前进的动力，但这种动力难以持续存在并改变我们的生活。

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Recently, researchers at the University of Colorado School of Medicine found that the effects of the surgery may not be long-lasting.

VOA: special.2011.07.05

But she says the research does show the need to study whether or not there are long-lasting effects of repeated exposure over several years.

VOA: special.2011.03.02

She says Washington is delivering on President Obama's promises by helping local communities develop long-lasting solutions and not by focusing on one-time projects.

VOA: standard.2009.11.03

"We need to rule out that there is a not long-lasting effect in healthy people, " Volkow said.

CNN: Cell phone exposure increases brain cell activity

It is a temporary one-time gimmick, not a long-lasting tonic for the recovery.

BBC: Ford vehicles at a Michigan plant

Draghi re-financing operations are more a band-aid than a fire hose, providing temporary support but not a long-lasting solution.

FORBES: ECB's Liquidity Injection Doesn't Justify This Rally, Could Derail It