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。
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.
月亮强大的引力就像是地球的一个陀螺仪，保证了地球轴心的稳定性。
The strong 3 gravitational pull of our moon ACTS as a global 4 gyroscope stabilizing the Earth's axis.
就像太空飞船一旦脱离了地球的引力，移动起来只需要花一点点的能量，继续养成好习惯也只需要不多的毅力。
And just like moving a space shuttle that has escaped the Earth's gravitational pull takes little energy, it also takes only little amount of willpower to continue doing your new habit.
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