It is composed of master, relay unit and module unit.

控制系统由上位机、中继单元和模块单元构成。

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Also described is an optional method of reliability screening for the components in the unattended relay unit.

叙述了这一中继机所用元器件的可靠性优选方法。

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And then the software system which includes master, relay unit and module unit was designed on the basis of hardware.

在硬件的基础上设计了包括上位机、中继单元和模块单元在内的软件系统。

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On Day 44 of the trek, both a radar device meant to measure the ice thickness and a satellite communications unit to relay the data are still not working - despite being brought back to the UK for repairs and then delivered to the team last week.

BBC: Arctic team gives up on ice radar