The distribution loop is equipped with two centrifugal pumps assembled in stand-by system, for purified water circulation.
配水回路装备有两台离心泵，按备用方式装配，用于净化水循环。
By raising questions about that creditworthiness, the downgrade also threw doubt on the Treasury's ability to stand behind the financial system.
通过质疑信誉度，降级还对国库券为金融系统做后盾的能力抛出了疑问。
The radio system supports automatic switchover to the stand-by controller if the active one goes off-line.
万一正在使用的控制器离线，无线电系统则可自动启用备用控制器。
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