He was alone on the bus, dozing off.
车上只有他一个人，这会儿在打盹。
He was alone in the bus, dozing off.
车上只有他一个人，这会儿正打着盹呢。
你又在打瞌睡了！
I often catch him dozing off in class.
我经常发现他在课上打瞌睡。
Once I caught him dozing off in class.
有一次我发现他在上课时睡着了。
Once we caught him dozing off in class.
有一次我们发现他在上课时打盹。
Her class is so boring that I can't help dozing off.
她的课太乏味以致我忍不住打起瞌睡来。
Her class is so boring, that I can't help dozing off.
他的课好无聊，我忍不住要打瞌睡。
Her class is so boring, that I can't help dozing off.
他的课好无聊，我忍不住要打瞌睡。
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