zǔ lǜ
意思解释：（The approximate ratio of the circumference of a circle to its diameter as calculated by Zu Chongzhi）1415926和3.1415927之间，并指出圆周率的约率为22/7，密率为355/113。为了纪念祖冲之，把他算出的近似值叫做祖率。
南北朝时祖冲之算出圆周率的近似值。为了纪念祖冲之，把他算出的近似值叫做祖率。…
The cipher out of the Zu Chong when the Northern and Southern Dynasties is circumferential the approximation of rate. To commemorate Zu Chong, call the approximation of his cipher out the approximate ratio of the circumference of a circle to its diameter as calculated by Zu Chongzhi. ...
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