In the first place you must rev it up to warm the engine.
首先你必须让发动机转起来预热。
Don "t leave the engine to warm up in winter; you" re burning petrol unnecessarily.
冬天的时候，不要让引擎空转，这是在不必要地费油。
How long should the engine warm up before we start?
这引擎在起动前应预热多长时间？
Start the engine and allow to warm up.
启动引擎，准许变热。
Start the engine and allow to warm up.
启动引擎，准许变热。
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