We are cruising along at 30 mph when, suddenly, the car flies up in the air and lands with a dull thump.
我们正以每小时30英里的速度行驶，突然，汽车腾空而起，砰的一声重重地落在地上。
2
All fifteen boys pick up their textbooks and thump their diminutive desks as they yell out each letter in unison.
十五个男孩都拿起他们的课本，边敲着小课桌，边整齐大声地读出每一个字母。
3
When he had travelled a few minutes it would begin a remorseless thump, thump, thump, and then leap up and away in a painful flutter of beats that choked him and made him go faint and dizzy.