fast chemistry

例句：

1. 1. The car is fast and can reach the destination in a short time.
   这辆车很快，可以在很短的时间内到达目的地。
2. 2. She is very fast at solving problems.
   她解决问题的速度很快。
3. 3. The race was won by the fastest runner.
   比赛由跑得最快的选手赢得。