A minute or so, or even less, will be sufficient for each practice period.

每个练习约莫一分钟就够了，甚至连一分钟都不需要。

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The study's subjects, a group of adolescent girls, underwent MRI scans before and after a three-month Tetris practice period.

此研究的对象是一组少女，分别在为期三个月的俄罗斯方块训练前后接受了核磁共振扫描。

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However, if you do, the length of the practice period may be reduced to less than the minute or so that is otherwise recommended.

如果你心生排斥，练习的时间可以缩短，少于通常建议的一分钟。

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Rebecca Skloot points out that this was not an unusual medical practice during this period.

VOA: special.2010.07.21

Things were getting better, but I noticed something funky come up during my practice period.

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The health department reported that an estimated 20, 493 infants in New York City were exposed to the practice in that period.

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In practice, this period can last years, and it has provided a strong disincentive for public unions to agree to any givebacks.

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