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

 同軸圓弧 [ㄊㄨㄥˊ ㄓㄡˊ ㄩㄢˊ ㄏㄨˊ; tong2 zhou2 yuan2 hu2]
 coaxial circular arc
 concentric arc (in spherical geometry)