You need about twenty minutes of exercise three times a week.

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You need about twenty minutes of exercise three times a week.
You need about twenty minutes of exercise three times a week.

You need about twenty minutes of exercise three times a week.
你一周需要三次大约20分钟的锻炼

你需要每周进行3次,每次大约20分钟的锻炼

你需要每周3次,每次20分钟左右的锻炼.

你需要每周做3次运动,每次20分钟。

同意大侠的版本.