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18.222.20.30
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From: MDBG CC-CEDICT Chinese-English Dictionary 漢英字典

 周三徑一 [ㄓㄡ ㄙㄢ ㄐㄧㄥˋ ㄧ; zhou1 san1 jing4 yi1]
 circumference of a circle is proverbially three times its radius
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