The engine is very noisy at high speed.
这个发动机转速高时噪音非常大。
In addition to this high engine speed concept, the optimized airflow rate considerably improves performance.
除了这个高转速的概念、优化气流速度有较大提高性能。
The new engine features high speed, small size and low costs....
以速度快，体积小，成本低为特色。
The new engine features high speed, small size and low costs....
以速度快，体积小，成本低为特色。
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