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The technician wanted to keep an auxiliary engine handy just in case.
技师想要一台备用发动机以防万一。
youdao
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The hospital has an auxiliary power system in case of blackout.
这家医院装有备用发电系统以防灯火管制。
youdao
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The hospital has an auxiliary power system in case of blackout.
这家医院装有备用发电系统以防灯火管制。
youdao