A third sources, the warming-enhanced decay of organic matter in forests and soils, especially in the middle and higher latitudes, is now being recognized as potentially significant.

第三个来源，特别是在中纬度和高纬度地区，森林和土壤中因气候变暖而加剧的有机物腐烂，现在被认为具有潜在的重大意义。

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youdao

This meant a lot of remote method calls between our middle and third tier.

这就意味着在中间层和第三层之间将有大量的远程方法调用。

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First World Brazil is broadly Southern, white and European - though there is a sizeable black middle-class - and Third World Brazil is largely to be found in the poorer North-East.

BBC: NEWS | Entertainment | Brazil's bland and beautiful

Abramson put her purse down on a white Formica desk that she occupies in the middle of the third-floor newsroom.

NEWYORKER: Changing Times

About a third of middle-class Americans believe their retirement income will be 50% of their current annual income or less.

FORBES: More Americans Say 80 Is The New Retirement Age