between planets造句

• The convenient length unit for measuring distances between planets is the astronomical unit
  在天文学上，太阳系内天体的距离惯用
• With the trait of power split and movable axis as well as application of inner meshed gear , planetary gear transmission has many advantages compared with general fixed axis gear transmission system . however , these advantages can not be realized without the balance of the load between planet gears
  行星齿轮传动具有功率分流和动轴线的运动特点，以及内啮合的合理运用，使其相对于普通定轴线齿轮传动在技术和经济上具有很多优点，但如果行星轮间载荷不均衡，则这种优点就难以实现。