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- Envelope of family of surfaces 曲面族的包络
- This article is to illustrate that the conic section is an envelope of family of straight lines, thus we discover the internal relations between the conic section and the solution of differential equation. 对圆锥曲线是直线族的包络进行了证明,揭示了圆锥曲线与微分方程的解之间的内在联系。
- Construct the nephroid as the envelope of a family of circles. 作一由圆族包络线所形成的肾脏线.
- The Demonstration of the Conic Section Is an Envelope of Family of Straight Lines 圆锥曲线是直线族的包络的证明
- Construct the astroid as the envelope of a family of lines. 作由线族包络线所形成的星状线.
- Construct the cardioid as the envelope of a family of circles. 作一由圆族包络线所形成的心脏线.
- Construct the deltoid as the envelope of a family of lines. 作由线族包络线所形成的三角线.
- Construct the cardioid as the envelope of a family of line segments. 作由线段族包络线所形成的心脏线.
- Construct the nephroid as the envelope of a family of line segments. 作由线段族包络线所形成的肾脏线.
- He have to go home because of family obligation. 出于对家庭的责任，他不得不回家。
- They like new patterns of family life. 他们喜欢新的家庭生活方式。
- Run salon of family of a diminutive, host needs to undertaking complete preparation beforehand. 举办一个小型的家庭沙龙，主人需在事先进行周详的预备。
- The mother is often the pivot of family life. 母亲往往是家庭生活的中心人物。
- triply orthogonal family of surfaces 三重正交曲面族
- The lion circled about the family of deer, waiting to attack. 那狮子在这群鹿四周转来转去，等待着时机进攻。
- This one land reform makes the life of family of farmer of almost all China got ameliorative, rural socioeconomy appearance produced historic change. 这一土地改革使几乎所有中国农民家庭的生活得到了改善,农村社会经济面貌发生了历史性变化。
- Lead oxide in the glass envelope of Black Light Blue (BLB) lamps. 布莱克蓝灯(蓝黑灯管)
- In this note, by means of families of parallel surfaces, we obtain a necessary and sufficient condition for a smooth surface M in H3 to be constant principal curvature. 借助平行曲面族的特征来刻划H3中的光滑曲面M;从而得到M是常主曲率的一个充要条件.
- After year's end distribution every family of the commune has money to bank up. 在年终分配之后，这个公社家家户户都有钱存入银行。
- She bethought herself of family obligations. 她牢记自己对家庭的责任。
