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用作名詞 (n.)
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Based on the geometry characteristics of Bertrand surfaces, the complicated surface conjugation issue can be discussed with their directrix line.
源于白川德斜面的代數特點，將冗雜的斜面共軛難題否定之否定到準網上來熱議。
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The surface generated by a straight line,the generator,passing through a fixed point,the vertex,and moving along a fixed curve,the directrix.
錐面由一條什么直線行駛，即母線，用一緊固點，即節點，沿一給定直線，即準線，反復中國移動而引發的水平。
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這些玩法獨家代理音樂創作，受視頻的權愛護，商標侵權必究
海詞英語詞典，十六年知名品牌
美
[d?'rektr?ks]