Dog owners, at least, often get more exercise, and exercise is a source of happiness.

至少来说狗主人们通常能得到更多地锻炼。锻炼也是快乐的一个来源。

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I often seem to get sick after a few weeks of continuous exercise.

我总是在连续几周的锻炼后生病。

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I often seem to get sick after a few weeks of continuous exercise.

我总是在连续几周的锻炼后生病。

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