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

 三等分角 [ㄙㄢ ㄉㄥˇ ㄈㄣ ㄐㄧㄠˇ; san1 deng3 fen1 jiao3]
 trisection (math.)
 trisecting an angle