First of all, there is no magic wand, no flip of the switch that is going to suddenly eliminate water scarcity. But there are concrete ways to turn the tide against water shortages.

首先，没有任何法宝或神奇的办法能够在瞬间消除水短缺问题，但是有具体的方法来扭转水短缺趋势。

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We can turn the tide against hunger, if we all work together to make existing food stocks available to hungry people everywhere, and to help Africa produce the extra food it needs.

我们能够扭转反饥饿的局面，只要我们一起努力让各地的饥民得到现存的粮食，并帮助非洲生产所需的更多粮食。

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Against the demons, this was just barely enough to turn the tide.

这刚好能够扭转与恶魔对峙的局势。

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If it is to fundamentally turn the tide against these guerrillas, the beleaguered Colombian army badly needs U.S. assistance.

FORBES: Fact and Comment

They asked the Americans for help, and U.S. officers, sensing a chance to turn the tide against Al Qaeda, seized the opportunity.

NEWYORKER: General Principles

The first is whether the force levels are enough to turn the tide against the Taliban and win Gen McChrystal's "short fight" by July 2011.

BBC: US Marine at forward operating base in Helmand