orbit

• Let's suppose that the electron at first is in the normal orbit .
  让我们假设电子起初在基态轨道上。
• The orbits of such faint asteroids are not yet known .
  但是对于这样暗的小行星的轨道，迄今尚未弄清。
• The orbits of the planets are ellipses with the sun at one focus .
  行星的轨道是以太阳作为焦点之一的椭圆。
• The russians plan to put a satellite into orbit round mars .
  俄国人计划把一颗人造卫星送入环绕火星的轨道。
• Thus each orbit may be called, alternatively, an energy level .
  因此，每一个轨道也可以交替地称作一个能级。
• This classification is the analogy of our previous picture of stable orbits .
  这种区分类似于前面的稳定轨道图形。
• The space shuttle can orbit at altitudes of up to 965 kilometers .
  这架航天飞机最高能在965公里的高度作轨道运行。
• The concepts of penetrating and non-penetrating orbits must be modified .
  必须修改贯穿式轨道和非贯穿式轨道的概念。
• Planetary perturbations make the earth's orbit about the sun irregular .
  行星的摄动使得地球绕太阳的轨道是不规则的。
• An electron moving in an excited orbit stays there only for a very short time .
  电子在激发态轨道上只能逗留很短的时间。