directrix n.(pl. directrixes , -trices...
n. (pl. directrixes , -trices ) 1.〔古語〕 ＝ directress. 2.【數學】準線。 “curve,directrix“ 中文翻譯： 曲線，準線“curvilinear directrix“ 中文翻譯： 曲準線“directrices directrix“ 中文翻譯： 的復數“directrix curve“ 中文翻譯： 準曲線“directrix of a conic“ 中文翻譯： 二次曲線的準線“directrix plane“ 中文翻譯： 準平面“scroll directrix“ 中文翻譯： 渦卷準線“directrix of a linear congruence“ 中文翻譯： 線性線匯的準線“directrice“ 中文翻譯： 女指揮“directreversinggear“ 中文翻譯： 直接逆轉裝置“directreversal color film“ 中文翻譯： 直接反轉彩色片“directropehaulage“ 中文翻譯： 頭繩運輸“directress“ 中文翻譯： n. 1.女指導者；女董事。 2.女導演；女指揮。
direful |
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Based on the geometry characteristics of bertrand surfaces , the complicated surface conjugation issue can be discussed with their directrix line . according to the different generatrix line which can be divided into common plane curve , circular - arc curve and straight line , bertrand conjugation surfaces are parted into three typical types , and the basic equation and differential formula are established , then the conjugation conditions are found . aiming at the inclusive problem , the structure condition is given 論文將白川德共軛按母線為一般平面曲線、圓弧、直線分為三種典型類型，分別建立了共軛的基本方程與微分關系式，據此給出了各種類型的共軛基本條件，發現這是一類更強更嚴的條件，存在有相容問題，進而研究了白川德共軛的結構條件，至此確立了白川德共軛的基本框架。 |
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So far , the main frame of the conjugation of betrand are established , on the basis of which , it is given that the primary condition the directrix line must be satisfied , the relative curvature of the conjugating surfaces , the relations between non - interventional condition and curvature axle of the directrix line , and so on . the transmission of normal circular - arc gear is a typical bertrand conjugation . in order to promote the transformation from theory to technology , the general principle of this kind of transmission is studied 為了使研究更加貼近于工程，便于解析處理，提出準面的概念，并確立由準面到準線的研究路線，給出了各種傳動形式下準面與準線的具體特征，證明了共軛準面上兩準線的誘導測地曲率等于零的這一不干涉條件，進而指出，當準面為平行軸和相交軸傳動的節曲面時，不干涉條件自然滿足。 |
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Constructing directrix for conic curve 圓錐曲線準線的幾何作圖 |