一位邻居, 90岁, 每天的运动是二项, 走路和游泳.
走5个小时, 游2个小时.
若干年后, 我准备练习游泳
一位邻居, 90岁, 每天的运动是二项, 走路和游泳.
走5个小时, 游2个小时.
若干年后, 我准备练习游泳
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