earth observing satellites

• 对地观测卫星

earth observing satellites的用法和样例：

例句

1. This is found by observing the doppler shift in the frequency of the radio signals broadcast from the satellite.
   这是通过观测卫星所发射的无线电信号频率中多普勒偏移来确定的。
2. By sheer coincidence, a trio of earth-monitoring satellites gave modelers the pristine, undistorted wave heights they needed for the Indian Ocean tsunami.
   十分巧合的是，有一组地球观测卫星提供了最原始且如实的海啸波高值，这是模型设计师模拟印度洋海啸时不可或缺的。