通过对直线段相对圆的各种位置关系作深入的研究，提出了一种简单而迅速的圆形窗口裁剪算法。

Based on profound study of various position relations between a line segment and a circle, a simple and rapid clipping algorithm for circular window is presented in this paper.

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其他西南民族,比如纳瓦加和阿帕奇,相对而言更像游牧民族.他们靠打猎,采集和袭击那些定居的邻居以便获得粮食而生.因为这些部族经常到处移动,他们的房子也不像布洛那样适合永居.纳瓦加人标志性的东朝向圆屋叫做赫甘,是用泥巴和树皮搭建的.

Other Southwestern peoples, such as the Navajo and the Apache, were more nomadic. They survived by hunting, gathering and raiding their more established neighbors for their crops.

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即使是其在中国销售的最便宜的车型，价格也是相对比较贵的（大约100美圆左右），根据德意志银行的数字，巨大机械仍拥有最大的市场份额，约7%左右。

Even its cheapest bikes, which are sold in China, are relatively expensive (at around $100), yet Giant has the largest market share, at around 7%, according to Deutsche Bank.

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There are only things that are circular to a greater or lesser degree.

只存在相对的圆的东西

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