the satellite sends them back to earthback to是介词短语?

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the satellite sends them back to earthback to是介词短语?
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the satellite sends them back to earthback to是介词短语?
the satellite sends them back to earth
back to是介词短语?

the satellite sends them back to earthback to是介词短语?
卫星将它们(信号)发送回地球 back应该是副词 to是介词