But he also admitted he will not be able to prevent all fraud in the second round.

VOA: standard.2009.10.23

Those doctors would still not be able to improve school performance of the kids with learning disabilities and they would still not be able to prevent cognitive impairment and loss of memory in older adults because at this point we don't really understand enough about learning To know which neurons and synapses within a circuit would need to be tinkered with.

他恐怕还是改变不了有学习障碍的孩子们的表现,阻挡不了老年人的认知功能损害和记忆力的衰退,因为我们对这一学科的确知之甚少,不知道知道回路中的到底是哪些神经元和神经突触需要修复。

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They acknowledge they will not be able to prevent similar practices in the future, but they are hopeful their study will promote changes for the better.

VOA: standard.2009.03.21

The defense minister, General Abdul Rahim Wardak, noted that even nations with "100-fold" more security resources, mentioning the United States, Britain,Spain,India, Indonesia and Pakistan, have not been able to prevent all attempted terrorist attacks.

VOA: standard.2009.08.16

Several studies have not been able to show that taking vitamin supplements in addition to a balanced diet helps to prevent disease.

VOA: special.2010.09.14

But researchers hope that one day they will be able to do that though a simple blood test, and prevent more deaths like Suzanna's.

VOA: standard.2010.02.08

"If you've ever worked on these cartel cases as I have as a prosecutor, you know a wall is not the best way to spend our dollars to prevent these drugs from coming into the United States and being able to apprehend and prosecute the smugglers themselves,".

VOA: standard.2009.03.24