因此，为了保持心态年轻，我们必须将学习当作一生的事业。
Therefore, to stay mentally young, we have to take learning as a lifelong career.
因此，为了保持心理年轻，我们必须将学习当作一生的事业。
Therefore, to stay mentally young, we have to take learning as a lifelong career.
因此，为了保持心理年轻，我们必须将学习当作一生的事业。
Therefore, to stay mentally young, we have to take learning as a lifelong career.
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