A ball can roll smoothly on a plane.
球可以在水平面上流畅地滚动。
The ailerons are moved in opposite senses to make the plane roll.
副翼向相反的方向转动就会使得飞机翻滚。
A roll in which the plane follows a spiral course.
飞机螺旋式的翻滚飞行。
The mathematic model has four degrees of freedom (surge, sway. yaw and roll), taking the couple motion of roll on horizontal plane motion into account.
预报采用进退、横漂、首摇和横摇四个自由度的方程，考虑了横摇对水平面运动的耦合影响。
The plane stress theory is applied to analyze the contact stress between cast track and roll wheel.
采用平面应力理论来分析滚轮与轨道的接触应力问题。
The geometrical theory of diffraction (GTD) has been used to calculate the Roll-Plane (Equatorial-Plane) radiation of the one and two vertical monopole elements on the base of the cone.
本文应用几何绕射理论(GTD)，计算了圆锥底上一元和二元垂直单振子滚动面(赤道面)的辐射图。
The geometrical theory of diffraction (GTD) has been used to calculate the Roll-Plane (Equatorial-Plane) radiation of the one and two vertical monopole elements on the base of the cone.
本文应用几何绕射理论(GTD)，计算了圆锥底上一元和二元垂直单振子滚动面(赤道面)的辐射图。
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