在平时阅读中,我们常接触到一个词可代表刚提到的一件事或将要提到的一件事。例: 1. Don’t read in the sun. It’s too bright. It’s bad for your eyes. 2. He is good at maths, as we all know. 3. ...and the swede wag warned that the great man would probablyask him some questions. There was some difficulty in explaining thisto the Swede. In ordinary reading, we often come into contact with a word that may represent one of the things just mentioned or one that will be mentioned. Example: 1. Don’t read in the sun. It’s too bright. It’s bad for your eyes. 2. He is good at maths, as we all know. 3. ...and the swede wag warned that the great man would Probablyask him some questions. There was some difficulty in explaining thisto the Swede.