... roar oneself hoarse 喊哑嗓子 roar an engine 使引擎发出轰鸣声 operation n. 作战行动；军事演习；军事行动 ...
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roar an engine
发动机轰鸣
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Again it seemed as though there was no driver present, but we could hear the dull roar of an engine left running.
跟上次一样，里面似乎没有司机，但是发动机仍在沉闷地轰响着。
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Ms. Marseille said in an interview Tuesday that she was entering a parking space near a library when she heard the engine roar.
WSJ: Crash Data Suggest Driver Error in Toyota Accidents
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