请问下面几个句子中,an author, the author 和 author 在意思上有差别吗?Qian Zhongshu, an author from China, wrote a book called Fortress BesiegedQian Zhongshu, the author of Fortress Besieged, passed away years ago.Qian Zhongshu, author of Fortress Besieged, passed away years ago.
The man who fixed the radio left this note.He lives in a skyscaper that is fifty stories high.为什么上面2句,后面的定语从句的先行词分别是man, skyscaper, 而不是The man, a skyscaper ? 为什么冠词不包括在先行词里呢? 怎么理解呢?