Use a stopwatch and set a limit.

使用秒表并且设定时间。

youdao

Time your showers with a stopwatch.

用一个秒表看着自己洗澡用了多长时间。

youdao

But here's the key: Use a stopwatch.

但是要注意关键问题：用一个跑表来计时。

youdao

suppose I asked you to time a 100 meter spring in the Olympics, but I give you a stopwatch that is measured in units of 15 seconds?

如果我要求你,在奥林匹克数给100米短跑计时，但我会给你一个秒表,它可以测出15秒的大小？

麻省理工公开课 - 固态化学导论课程节选

I sit alongside the director with the script and a stopwatch,

我坐在导演身边，拿着剧本和秒表，

制作电视节目 - SpeakingMax英语口语达人

The Sheffield volleyball moppers practiced for nine months at a gym with supermarket mops and a stopwatch.

WSJ: When These Olympians Say Their Job Is 'No Sweat,' They Mean It

As watch connoisseurs know, a chronograph is a watch that also has the capacity to act as a stopwatch.

FORBES: Watch Out

The RM 008 chronograph tourbillon (a stopwatch) was so complicated that only one master watchmaker, Fernand Simao, had the skills to put it together.

FORBES: Magazine Article