再次是用水力发电和天然气发电等可控的手段作为备用方式。
Finally, they can arrange for backup power generation by a controllable power source like hydropower or natural gas turbines.
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。
The distribution loop is equipped with two centrifugal pumps assembled in stand-by system, for purified water circulation.
该门禁系统可以采用IC卡和手机短信两种方式控制，手机控制是作为备用方式，防止读卡器被人为损坏。
One is IC card, the other is GSM. The second way is spare avoiding any manmade possibility that IC identifying instrument. is damaged.
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