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。
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.
调查结果显示，有大约5%的职工患有视力疾病，而在他们中间有三分之一的人患有青光眼。
About 5 percent of the workers in the study had visual field problems. A further test revealed about a third of them had suspected glaucoma.
从火焰的底部起至三分之一或中间处把各个火焰连起来，从这一点开始各自分开向上。
Join the flames together about a third of the way or midway from the base of the fire and have the flames separated going up from that point.
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