axial heat conduction

例句：

1. 1. The machine has an axial drive system.
   这台机器有一个轴驱动系统。
2. 2. The axis of the planet is perpendicular to the ecliptic.
   行星的轴与黄道平面垂直。
3. 3. The axis of rotation is at the center of the earth's gravity field.
   旋转轴位于地球重力场的中心。