构图比较通用的情况是将地平线放置在图像三分之一的地方，(上三分之一，或者下三分之一)而不是图像正中。
A compositionally natural spot for a horizon is on one of the thirds lines in an image (either the top third or the bottom one) rather than completely in the middle.
大约只有半数的黑人儿童由父母双亲同时抚养，有三分之一的在贫困的环境下长大，相比之下，白人儿童中这一比例只有七分之一。
Almost half of all black children are being raised by two parents, and a third of them are being brought up in poverty, compared with one-seventh of white children.
第二，据认为约三分之一的人是“文盲”，在这种情况下甚至成熟的医学上的脑电图技术都无法将他们的脑活动转化成行为。
Second, about one-third of the population is considered “illiterate”, meaning in this context that not even a full-fledged medical EEG can convert their brain activities into actions.
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