... relay automatic telephone system 继电器式自动电话系统 relay back-up 继电器后备保护，后备继电器 relay base 无线电中继站 ...
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relay back up 继电器后备保护
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Back then many companies ran a free, open-source e-mail relay technology but ended up spending more than they thought they would making the stuff work.
FORBES: You Get What You Pay For
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