The app allows users to chrone their workouts.

这个应用程序允许用户计时他们的锻炼。

The coach used a stopwatch to chrone the runner's speed.

教练用秒表计时跑步者的速度。

The scientist needs to chrone the reaction time accurately.

科学家需要准确计时反应时间。

Can you chrone how long it takes to complete this task?

你能计时完成这个任务需要多长时间吗？

He forgot to chrone his presentation, so it went over time.

他忘了计时他的演讲，所以超时了。