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- The forming principle of Niemann worm wheel hob is described, the curved face equation of Niemann worm is deduced, and the normal profile of the worm wheel hob is calculated. 论述了尼曼蜗轮滚刀的成形原理,推导了尼曼蜗杆曲面方程,计算了蜗轮滚刀的法向齿形。
- Firstly it constructed a curved face equation, and then did self-learning by adjusting power gene and center and width of the radial basis function with restriction condition on reflect function, finally gained satisfactory curved face equation. 该算法先采用网络构造一个曲面方程，再利用反射函数作为约束条件，通过调整权因子和径向基函数中心和宽度对网络进行自学习，得到一个满意的曲面方程。
- Based on the tooth face equation of bi-arc bevel gear,the tooth face,the tooth and the whole gear are drawn to testify the correctness of the tooth face equations. 以双圆弧锥齿轮的齿面方程为依据，绘制出双圆弧锥齿轮的齿面、轮齿及整个齿轮的图形，从一侧面验证了齿面方程的正确性。
- Rotated curving face Equations, which originated from two kinds of hyperbolas rotating around asymptote was discussed. 摘要讨论不同类型的双曲线绕其渐近线旋转生成的旋转曲面方程，其中包括双曲线为等轴双曲线的情形；
- It is a fact of life and you must face it. 这是严酷的现实，你必须面对它。
- He tried to put a bold face on his failure. 他对自己的失败装出一副满不在乎的样子。
- I dry my hands and face with the towel. 我用毛巾擦干了双手和面部。
- The sea have erode the cliff face over the years. 海水经年累月冲刷著峭壁的表面。
- He stumbled over a stump and fell flat on his face. 他给树桩一绊，摔了个嘴啃泥。
- Get the stardust out of your eyes and face reality. 抛弃天真的想法而面对现实。
- A dash of water in his face will revive him. 向他脸上泼水能使他苏醒。
- I felt a certain indisposition to face reality. 我多少有些不愿意面对现实。
- Her face was overclouded with grief. 她的脸色因悲伤而变阴沉。
- His ashen face showed how shocked he was. 他面如土色，说明他多么惊骇。
- The shadow of death is on his face. 死亡的阴影笼罩在他的脸上。
- Her face is sprinkled with tiny freckles. 她的脸上有点点的雀斑。
- The climber had to negotiate a steep rock face. 那攀登者得攀越一陡峭岩石。
- The old lady has a haggard face. 老太太的脸很枯槁。
- An expression of pain flitted across her face. 她脸上闪过一种痛苦的表情。
- She covered her face with her hands. 她双手掩面。
