工程师们正使飞机的发动机高速运转。
也就是说，在发动机高速运转时，这样的动作每秒钟要发生300次。
That is, there will be as many as 300 of these events every second that the engine is running at high speed.
工程师们正在高速运转发动机来检测飞机是否能立即飞行。
The engineers are running up the engine to see if the plane is ready to fly.
谷物联合收获机传统的冷却方式是由发动机曲轴以定传动比形式驱动冷却风扇和水泵运转的，这种冷却方式经常出现低速大负荷时冷却不足、高速小负荷时冷却过度等问题。
The driven force of fan and pump in the traditional way of the cooling system in cereal combining harvesters comes from crankshaft of the engine by decided transmission ratio.
谷物联合收获机传统的冷却方式是由发动机曲轴以定传动比形式驱动冷却风扇和水泵运转的，这种冷却方式经常出现低速大负荷时冷却不足、高速小负荷时冷却过度等问题。
The driven force of fan and pump in the traditional way of the cooling system in cereal combining harvesters comes from crankshaft of the engine by decided transmission ratio.
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