英语语法分析

Eleven point two kilometers per second, at which satellites can be freed from the gravitation of the earth, is called "escape speed".

卫星以11.2千米每秒的速度前进可以脱离地球引力，这被称为“逃逸速度”。

One of them is the force of gravitation (地心引力), which tries to pull the satellite towards the earth and is like a rope which keeps the satellite from flying away.

其中一个是地心引力的力量，这股力量试图把卫星拉向地球，就像一根把卫星绑住的绳子，防止卫星飞远了。

This is called gravitation, or gravity.

这叫引力。