这是根据他使用的方法在计算圆周率的价值和数量方面的后代能够知道和使用的圆圈更准确。
It was according to the methods he used in calculating the PI value and the sphere volume that posterity was able to know and use the circle more accurately.
其中一种乡村舞叫圆周舞，要求所有的跳舞者组成一个圆圈。
In one country dance, dancers formed a circle. This dance was called a round.
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