Read carefully the introduction to Project 4.2 (pp. 228-229). This project brings together all the issues and concepts we have discussed in previous weeks. As it says in these pages.
小心阅读习题4.2（228-229页）的介绍。这个习题把我们前几周讨论到的议题和观念都综合在一起。如同在这几页里说到的。
Read carefully the introduction to Project 4.2 (pp. 228-229). This project brings together all the issues and concepts we have discussed in previous weeks. As it says in these pages.
小心阅读习题4.2（228-229页）的介绍。这个习题把我们前几周讨论到的议题和观念都综合在一起。如同在这几页里说到的。
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