helical surface的用法和樣例：
例句
- Basic structure and operation principle of the parallel grinder for helical drill point grinding is presented.
給出螺旋面鉆尖刃磨機床的基本結構及其工作原理。 - The helicoid equation of contacting surface befween workpiece and die in the process of cross wedge roiling was proposed in this paper.
建立了楔橫軋變形工件與模具接觸面的旋轉螺旋面方程。
