I exercise three or four times a week.
我一周锻炼三四次。
My doctor told me to increase my exercise program, so I switched from not exercising three times a week to not exercising six times a week.
医生建议我增加运动次数。所以我从每周不锻炼三次，改为每周不锻炼六次。
As for physical exercise, I will ride my bike back and forth to school three times a week to keep my body strong.
至于体育方面，我会每周骑脚踏车来回学校和我家，让我的身体能更强壮。
I need about twenty minutes of exercise three times a week.
我需要一周三次大约20分钟的锻炼。
I need about twenty minutes of exercise three times a week.
我需要一周三次大约20分钟的锻炼。
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