As usual, I did homework and joined many kinds of training class, but it 'sa joyful summer vacation this year.

和往年一样，我做家庭作业并参加了各种培训班，但是，今年的暑假是一个愉快的暑假。

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Multiple logistic regression analyses were used to determine the association between usual number of hours of sleep during a 24-h period and si and SA (past 12 months and lifetime).

应用多元逻辑回归分析方法确定24小时的一个周期内常规睡眠的小时数与SI和SA(过去12个月和一生)之间的关系。

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