技师想要一台备用发动机以防万一。
The technician wanted to keep an auxiliary engine handy just in case.
我们需要为这个雪橇准备一个备用发动机。
首席工程师，电工到机房，备用发动机，其他机组订单鼓起。
Chief engineer and electrician go to engine room, standby engine, other crew muster for order.
备用发动机：我们能为每架飞机在中国至少提供一台备用发动机。
Spare engine: We will provide at least one spare engine ready in China for each aircraft.
不幸的是备用车发动机有问题不能用。
Unfortunately we had a problem with the engine on the second bike, and were unable to use it.
不幸的是备用车发动机有问题不能用。
Unfortunately we had a problem with the engine on the second bike, and were unable to use it.
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