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chugging

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n.(=chuffing)引擎中燃料的间歇性燃烧

难易程度:

chugging为短语/超纲词汇
1. It suddenly dawned on me that this express was not roaring down the line at ninety miles an hour, but barely chugging along at thirty.
    我突然感到这趟快车并没以时速90英里的速度呼啸前进,而是卟哧卟哧地向前爬行,时速仅30英里。

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