Use a stopwatch and set a limit.
使用秒表并且设定时间。
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。
A watch that can measure seconds or a stopwatch.
一个带秒数显示的手表或一个计时器。
Say the dialogue out loud and time it with a stopwatch.
大声吟诵对白同时用秒表计时。
Drop the barometer and time its fall with a stopwatch.
扔下气压表，用秒表测出它降落的时间。
In addition, this system also has the stopwatch function.
此外，此系统还具有秒表功能。
You can use a StopWatch class.
您可以使用一个秒表类。
用秒表记录时间。
Next year I will run against the Stopwatch!
明年我将与时间赛跑！
Stopwatch in hand, I observe her from behind a cereal display.
我握着秒表，在谷物食品货架后方观察她。
Stopwatch in hand, I observe her from behind a cereal display.
我握着秒表，在谷物食品货架后方观察她。
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