1
use a stopwatch
Use a stopwatch to measure lap times.
用秒表测量每圈时间。
秒表
stopwatches — plural of stopwatch
先理解核心含义，再看它在真实句子里的用法。
秒表
a small clock that can be started and stopped to measure exactly how long something takes
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。
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。
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。
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。
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。
Not this
I use a watch to time the race.
Use this
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。
Not this
I counted the lap with a stopwatch.
Use this
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。
Choose the next layer that will help you use stopwatches with more confidence.
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可数名词
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.