range difference measurement of satellite fixing

例句：

1. 1. The range of the satellite is about 500 kilometers.
   卫星的射程大约是500公里。
2. 2. The range of this device is very wide.
   这个设备的射程非常宽。
3. 3. The range of the radar was too narrow for our needs.
   雷达的射程太窄，不能满足我们的需求。