Then far off a motor barked and roared and kept on roaring like half a dozen truck engines.

然后远处的一辆汽车咆哮着咆哮着， 像半打卡车引擎一样不停地咆哮。

Baba burst out in gales of his deepthroated laughter--a sound not unlike a truck engine revving up--and, when he could talk again, explained to us the concept of voice dubbing.

爸爸爆发出一阵爽朗的狂笑--与汽车引擎加速的声音颇为相像，等他能说得出话的时候，告诉我们电影配音是怎么回事。