(of an engine in a vehicle)make a roaring sound by being run at very high speed
（机动车发动机高速运转时）呜呜叫。
[with obj.]cause (an engine in a vehicle) to make such a sound in this way
使（机动车发动机）发呜呜声。
[no obj., with adverbial of direction](of a vehicle or its driver)travel at great speed
（机动车或其司机）高速行驶
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she still had the car and she would vroom up at midnight .她仍拥有那部车，会午夜飙车。
the roaring sound of an engine or motor vehicle
（发动机或机动车的）呜呜声。
used to express or imitate such a sound to suggest speed or acceleration
［用于模仿这种声音，表示速度或加速］呜
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press the ignition button and vroom! 按点火按钮，呜的一声加速！
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vroomv.呜呜叫；使（机动车发动机）发呜呜声；高速行驶
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roomn.空间；地盘；房间；室；机会；范围；房间里的人；寓所；余地；一套房间
" 1960s： imitative． "
