汉英词典
Chinese-English Dictionary
MEANING OF 切线
切线 (切線)
tangent line (geometry)
〈名〉平面内和圆只有一个交点的直线叫做圆的切线;和球面只有一个交点的直线叫做球的切线。
qiè/qiē 线 () xiàn
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