Civil wars are so costly that well-timed military actions are quite likely (though not certain) to be cost-effective.

内战的代价如此高昂，因此，适时的军事行动很可能是成本有效的(尽管这不是必然的)。

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Shielding is the term that's used, it brings up a certain image in our mind, and even though that's not precisely what's going on, it's a very good way to visualize what we're trying to think about here.

它带给我们一个确定的画面，虽然那不够精确，但当我们尝试去考虑它的时候,它确实是一种很好,的形象化的方式。

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Mr Zuma, formerly the party's deputy leader, is now in prime position (though not certain) to succeed Mr Mbeki as the country's next president.

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It's not certain, though, whether corporations will make use of the new rules to push a particular issue.

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The proposal therefore looks likely to succeed, though that will not be known for certain until the countries that have signed CITES meet to discuss the proposal in March 2010.

ECONOMIST: Efforts to ban the international trade in bluefin tuna