简单的英汉词典 用三层结构（界面层、事务处理层、数据层）编辑，实现了字典的添加、查找、背单词功能。关键在于三层结构的理解。-simple English-Chinese dictionary with the three-tier structure (the interface layer, business layer, data layer) editing, Implementation of the dictionary to add that you back the word