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Preface [ˈ pref ə S] [712; pref ə s [ˈ pref ə S] NVI & vt prefacesprefa preface this book has a preface wtten by the thor himself, the thor's intduction [ˌᠬᠬˈ NTR ˈ D ʌ K ə; pref ə s [ˈ pref ə S] NVI & vt prefacesprefa preface; n] Intduction the intduction of this book is intduced by the thor [ᯒ f ɔ: W ɜ d [ˈ f f f ɔ: W ɜ d [ˈ f f ˈ f f ˈ f ˈ f ˈ f ɔ: RW ɜ: Rd] the preface of this book intduces the pblems that must be solved in this paper, its dlopment backgund and siificance, and makes a preliminary comment on the preface of this book.
前言[ˈprefəs][712; prefəs[ˈprefəs]nvi&vt prefacesprefacesprefa序序序序序书有一个序书由作者自序撰写，作者简介[ˌ6ɪɪntrˈˈdʌkə; n]n简介简介书引言是由作者简介[ᯒfɔ：wɜd[ˈf fɔ：wɜd[ˈf fˈf fˈfˈfɔ：rwɜ：rd]n前言书前言由文绪论部分介绍了文必须解决问题及其发展背景、意义等，并对书前言作了初步评述。
① Mr. Xiang Ming, D SC, retned to China without hesitation. I have an obligation to devote my life to my motherland Ming, male, years old, now works in Beijing chemical plant.
After graduating fm Beijing Institute of engineeng, he was sent to study chemistry at Massachusetts Institute of technolo in the United States. In, he received his doctorate. Soon, the of Walsh company ted to employ him and pmised him a good salary.
But Mr. Xiang refused to accept the job. ① doctor of science.
② he devoted his whole life to a certain job. ③ he got his bachelor's degree / Master's degree / personal intduction. Mr.
Xiang was a young man after graduation, but Mr. Xiang didn't accept the job. He was listed as a male engineer soon after Mr.
Xiang Ming is a man of his years old. He works in Beijing chemical plant now. He is an engineer.
① ②③④⑤一位献身祖国博士①麻省理工学院②沃尔什公司一位献身祖国医生向明先生，D Sc①，毫不犹豫地回到了，我有义务把我一生献给祖国②heMr Xiang Ming，男，岁，现在北京化工厂工作年从北京工程学院毕业后，他被派往麻省理工学院学习化学，年获得博士学位。不久，沃尔什公司经理试图雇用他，并答应给他一份不错薪水，但项先生不接受工作①理学博士②毕生致力于某项工作③博士学位获得学士学位/硕士学位/个人简介项明是毕业后年仅岁男子，但项先生不接受此项工作男，年后不久即被列为男一个工程师向明先生是一个他岁人他现在在北京化工厂工作他是一个工程师。