Moving a horizon in a landscape to the position of one third is often more effective than placing it in the middle, but it could also be placed near the bottom one quarter or sixth.

将一幅风景画的水平面放在三分之一处要比放在正中间效果更好，但是，它也可以放在接近底部的四分之一或六分之一处。

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The lowest floor was five cubits wide, the middle floor six cubits and the third floor seven.

下层宽五肘，中层宽六肘，上层宽七肘。

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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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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