use a stopwatch
Use a stopwatch to measure lap times.
用秒表测量每圈时间。
秒表；测量从启动到停止所经过时间的计时器。；可启动或停止以精确计时(如赛跑)的计时器；计时表；码表
a small clock that can be started and stopped to measure exactly how long something takes
秒表；测量从启动到停止所经过时间的计时器。
A timepiece designed to measure the amount of time elapsed between a particular time when activated and when the piece is deactivated.
可启动或停止以精确计时(如赛跑)的计时器
a timepiece that can be started or stopped for exact timing (as of a race)
He checked the stopwatch to see how fast he ran the lap.
他看了看秒表，看自己跑完这一圈有多快。
用法提示：这里的“stopwatch”是名词，指用来精确计时的秒表。
The coach started the stopwatch when the runner left the starting line.
教练在运动员离开起跑线时按下了秒表。
用法提示：句中“stopwatch”作名词，是教练用来计时的秒表。
My new stopwatch can measure time to the hundredth of a second.
我的新秒表可以精确到百分之一秒。
用法提示：此处“stopwatch”为名词，表示能精确计时的秒表。
Use a stopwatch to measure lap times.
用秒表测量每圈时间。
启动或停止秒表的动作。
Stop the stopwatch when the final answer is given.
给出最终答案时停止秒表。
使用秒表精确计时。
She timed the speech with a stopwatch.
她用秒表给演讲计时。
更宽泛，可用于任何计时设备，不特指体育计时。
更正式，指高精度计时器，通常用于科学或航海。
同义词，但较少使用，通常指实验室用计时器。
grammar · medium
易错句子I use a watch to time the race.
正确表达I use a stopwatch to time the race.
学习者常将“watch”（手表）误用于表示秒表，因为中文里“秒表”和“手表”词形相似。应使用stopwatch特指计时用的秒表。
grammar · medium
易错句子I counted the lap with a stopwatch.
正确表达I timed the lap with a stopwatch.
错误地使用了“count”（计数）来搭配stopwatch，正确动词应为“time”（计时），表示用秒表测量时间。
计时器通常用于倒计时或定时（如烹饪），而秒表用于精确测量经过的时间，通常可以启停。
精密计时计是高度精确的计时仪器，常用于航海或科学测量，而秒表是普通精确度的计时工具。
手表用于显示当前时间，而秒表用于测量一段时间间隔，通常带有启动和停止功能。
启动秒表开始计时
He started the stopwatch the moment the race began.
比赛一开始，他就启动了秒表。
按停秒表
She stopped the stopwatch as the runner crossed the line.
选手冲过终点线时，她按停了秒表。
把秒表归零
Press this button to reset the stopwatch before the next lap.
下一圈开始前，按这个按钮把秒表归零。
电子秒表
The referee used a digital stopwatch to record the times.
裁判用电子秒表记录时间。
用秒表给…计时
The coach timed every sprint with a stopwatch.
教练用秒表给每次短跑计时。
verb
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