Questionnaires concerning the causes of dozing in class were collected from 120 students in a medical university.
通过对某高校120名大学生上课打瞌睡情况的调查,发现导致该现象发生的主要原因是“头天晚上睡眠不够”、“教师讲课吸引力不够”、“对课程内容不感兴趣”,以及“教室环境不好,空气不流通”。
To pass(time)by drowsing.
打瞌睡消耗（时间）
To sleep for a brief period, often during the day; doze.
小睡,打瞌睡短暂小睡,通常在白天打盹；打瞌睡
At last she began to nod.
最后，她开始打瞌睡了。
He dozed off in class.
他在上课时打瞌睡。
She ofter nods off during the afternoon.
她下午常常打瞌睡。
I dozed off in front of the TV.
我看电视时打瞌睡了。
The cat dozed off by the fire.
那只猫在炉边打瞌睡。
"Uh, oh. There I go nod off again. "
哎呀,我又打瞌睡了
He dozed off with his head on his arm .
他头枕着胳膊打瞌睡。
He nodded off over his paper.
他在看报时打瞌睡了。
She willed herself to keep awake.
她努力使自己不打瞌睡。
Mary nidnoded her head.
玛莉打瞌睡不断地点头。
I hope that you aren't going to flake out.
我希望你不要打瞌睡。
Uh, oh. there I went nodding off again .
哎呀，我又打瞌睡了。
She dozed off during the sermon
她在做礼拜时打瞌睡。
Was she discovered dozing?
她被发现在打瞌睡吗?
He was unable to stay awake at night
他晚上不能不打瞌睡。
People nodded as the speech dragged on.
人们在听缓慢而单调的发言时打瞌睡。