orbital cycles

• 轨道周期

orbital cycles的用法和样例：

例句

1. The earth's orbital cycles were driving a simultaneous natural cooling trend, especially at high northern latitudes.
   地球轨道周期正在造成自然的冷却趋势，尤以北方高纬度地区为最。
2. With Callisto's orbital period of about half a month, the entire sequence could take less than a year.
   由于木卫四绕木星公转的轨道周期约为半个月，整个过程只需不到一年。