Cube: a regular solid having six congruent square faces.
立方体：一种通常有六个相等的正方形侧面的正立体。
Get plenty of sleep. Sleep is directly related to academic performance. Preteens and teenagers especially need to get regular, solid sleep.
保证充足的睡眠。睡觉和学习表现有直接关系。青少年尤其需要规律，有质量的睡眠。
Get plenty of sleep. Sleep is directly related to academic performance. Preteens and teenagers especially need to get regular, solid sleep.
保证充足的睡眠。睡觉和学习表现有直接关系。青少年尤其需要规律，有质量的睡眠。
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