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

 主法向量 [ㄓㄨˇ ㄈㄚˇ ㄒㄧㄤˋ ㄌㄧㄤˋ; zhu3 fa3 xiang4 liang4]
 principal normal vector (to a space curve)