他朋友不多，有时候上课打瞌睡。
他上课打瞌睡。
我经常得在上课的前一天晚上备课，为了不打瞌睡，我的很多工作都是距离我们房子一个街区的埃尔姆街餐馆里完成的。
I often had to prepare my lectures late in the evening before the day I delivered them. To stay awake, I did a lot of my work at the Elm Street Diner, about a block away from our house.
通常上课开始十分钟左右我就会打瞌睡了。
Usually, I will nod off when the class begins about ten minutes.
你上课偶尔会打瞌睡吗？
他上课又打瞌睡了。
如果你想想，为了支付母亲的医药费，莫莉必须辛苦工作，就不会嘲笑她在上课时打瞌睡了。
Put yourself in Molly's shoes. You wouldn't laugh at has to work to pay the medical bills for her sick mother.
上课的时候我感觉打瞌睡不能仔细听老师讲课。
When I was in class, I felt sleepy and could not listen to the teacher carefully.
她看起来老是很累，上课时常打瞌睡。
She looks tired all the time and keeps falling asleep in her classes.
她看起来老是很累，上课的时候经常打瞌睡。
She looks tired all the time and keeps falling asleep in her classes.
老师发觉他在上课时打瞌睡。
老师发觉他在上课时打瞌睡。
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