每个练习约莫一分钟就够了，甚至连一分钟都不需要。
A minute or so, or even less, will be sufficient for each practice period.
一天练习三、四回，每一个只需一分钟左右就够了。
Three or four practice periods, each to last a minute or so, will be enough.
一天练习三、四回，每一个只需一分钟左右就够了。
Three or four practice periods, each to last a minute or so, will be enough.
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