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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This part of the course had less technical apparatus than the first part of the course so it will concentrate on the middle third of the course up to this lecture.

这门课的这个部分比第一个部分的,技术器械少，所以它将着重于,今天下课之后这门课还剩三分之一。

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Oregon ranks in the middle third for all of our pollution metrics, including 29th in EPA toxic waste violations and 33rd in toxic exposure, according to the RSEI index.

根据RESI指数，对于我们的污染指标俄勒冈州排名三分之一，包括排名29位的EPA有毒物质排放和排名33位的毒素暴露。

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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