payload and apogee performance

例句：

1. 1.The spacecraft's payload is a satellite.
   这个航天器的有效载荷是一个卫星。
2. 2.The payload of the cargo ship was heavy.
   这艘货船的有效负载很重。
3. 3.The payload of the satellite was a communication system.
   这颗卫星的有效负载是一个通信系统。
4. 1. The astronaut reached the apogee of the space station.
   宇航员达到了太空站的最高点。
5. 2. The apogee of the mountain is visible from here.
   这座山的顶点从这里可见。
6. 3.The apogee of the moon is about 173,000 miles away.
   月球的最高点大约距离地球173,000英里。