said people need to exercise thirty minutes each day for at least five days to get the health benefits of exercise.
VOA: special.2010.06.08
But I like to just walk here for exercise,
但我只喜欢在这里散步,锻炼一下身体。
or actually ask the TFs in section to hand out a meter exercise that you can do for next week.
或者是叫助教在课间,发下个星期你们要做的关于节拍的作业。
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