THE natural processes which dispose of carbon dioxide are, in aggregate, rather slow, which means that an increase in the atmosphere’s carbon-dioxide level will, left to itself, last a long time.

就总体而言，二氧化碳排放的自然过程是相当慢的，这便意味着，在对二氧化碳放任不管的情况下，大气层中二氧化碳含量在很长时间内都会持续增加。

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Salt isn't much good if left to itself, and a light that's hidden helps no one.

无味的盐没有多少好处，掩藏的灯帮不了任何人。

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THE natural processes which dispose of carbon dioxide are, in aggregate, rather slow, which means that an increase in the atmosphere's carbon-dioxide level will, left to itself, last a long time.

总体来讲，处理（或清除）二氧化碳的自然过程是相当缓慢的，这意味着大气中增加的二氧化碳含量如果靠自然过程处理，会持续很久。

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Left to itself the market will cherry-pick, leaving swathes of bad risks for taxpayers to finance.

ECONOMIST: Asia's security

Whichever of these approaches works, there seems little hope that NASA, left to itself, will get it right next time.

ECONOMIST: Lost in space

BBC's justification for the licence fee is that it provides services that the market, left to itself, would not provide.

ECONOMIST: Digital follies