The check must be performed in 2 different points during one complete revolution .
这个检查必须在两个不同的点进行。
The period oftime it takes a planet to complete one revolution is called a year.
这个一颗行星完成一次公转所花的时间被称为一年。
The period oftime it takes a planet to complete one revolution is called a year.
这个一颗行星完成一次公转所花的时间被称为一年。
应用推荐