electronic race timer

例句：

1. 1.The electronic race timer was used to measure the speed of the cars during the race.
   电子计时器被用来测量赛车的速度。
2. 2.The electronic race timer was used to record the results of the race.
   电子计时器被用来记录比赛的结果。
3. 3.The electronic race timer was used to ensure that the race was running smoothly.
   电子计时器被用来确保比赛顺利进行。