He was so absorbed in his work that he didn't see me．

他全神贯注于工作，没有看到我。

　　动词词组be absorbed in相当于giving all one's attention to，意思是“沉湎于；全神贯注于”。句子中还用到了一个so...that的句型，表示“太……以致于……”。
　　再如：Time passes quickly when you are absorbed in reading a good book．
　　当你沉醉于阅读一本好书时，时间会过得很快。