The old bus was revving its engine, ready to start the journey back towards Mexico City.

这辆旧巴士轰着油门，准备启程返回墨西哥城。

《柯林斯英汉双解大词典》

Then the analysis on the city velocity distribution of the city bus, the speed distribution and torque distribution of the engine were made.

然后对武汉市公交车的车速分布、转速分布以及扭矩分布规律进行了分析。

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