Lesson 56 Faster than sound! sound - 任何声音 voice - 人的声音 noise - 和周围 不和谐 的声音； 噪音 *Tom will enter for the race. There is a great deal of excitement. exciting excited *handsome Benz VS Rolls-Royce rival *After a great many loud explosions, the race began. explosion n. 爆炸；轰 响 explode v. 爆炸 explore v. 探险 explorer n. 探险 家 *Many of cars broke down on the course. break down 抛锚 ；出故障 break out 爆发 （战 争 ） *It sped downhill at the end of the race. uphill down stairs up stairs turn down 关小 up stairs 开大 turn on
