China's first man-made satellite Dongfanghong 1 made China the fifth country to send a satellite independently.
中国第一颗人造卫星“东方红一号”使中国成为第五个独立发射卫星的国家。
2
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。
3
Pointing refers to the requirement to point the satellite (or an instrument on the satellite) toward some ground object.