Because the moon's body blocks direct radio communication with a probe, China first had to put a satellite in orbit above the moon in a spot where it could send signals to the spacecraft and to Earth.
Direct palpation with the fingers or indirect palpation with a probe is aimed at determining the size, consistency, temperature and sensitiveness of a lesion or organ .
用手指直接触诊或用一根探针间接触诊，目的在于确定损害或器官的大小、坚度、温度和敏感性。
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However, it is not possible to do direct measurement, since the probe and the receiver are both sealed.