N (in certain universities and colleges) a common room for the use of postgraduate students (在某些大学和学院)研究生活动室 → compare junior common room, senior common room
That number falls off slightly in middle age, but only in people 65 and older is leaving the phone in another room as common as sleeping right next it.
这种情况在中年人中会略微下降，但只有65岁及以上的老人才会习惯睡觉时把手机放在其他的房间。
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