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 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