axis

• A wheel turns on its axis .
  轮子在轴上旋转。
• This axis may be horizontal or it may slant or plunge .
  这条轴可能是水平的，也可能是倾伏的。
• Venus has the distinction of spinning "backward" on its axis .
  金星具有沿主轴反向自转的特性。
• The dipole does not radiate energy in the direction of its axis .
  偶极子在它的轴的方向上不发射能量。
• Draw a line perpendicular to the horizontal axis through the point .
  通过这两直线的交点做横轴的垂线。
• Those rays which are near the axis are sometimes called paraxial rays .
  靠近轴的那些光线有时叫作近轴光线。
• He was drafted by the u.s. an army which was at war with axis powers .
  美国与轴心国交战，他就应征去当兵了。
• Planets revolve about the sun and rotate on their axis .
  行星在围绕太阳旋转的同时，也绕着它们的自转轴自转。
• The line of sight must be approximately perpendicular to the horizontal axis .
  视线必须近似地垂直于水平轴。
• Only by the utter destruction of the axis was a decent world possible .
  只有彻底摧毁轴心，才能有一合理的世界。