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20min是20分钟的意思。min是英语单词minute的缩写，分钟的意思，主要用在数学表达式的单位中。例：986 r/min 则表示每分钟986转。
minute例句
Each company was given ten minutes to make its pitch.
每个公司有十分钟时间进行推销宣传。
The average response time to emergency calls was 9 minutes.
紧急求助电话的平均回应时间是9分钟。
Would you mind leaving us alone for a few minutes?
你不介意让我们单独待一会吧？
Could you possibly forget about work for five minutes?
你能不能匀出五分钟来不去想工作？
Could I see you for a minute?
我能见你一下吗？