美国在21世纪所面对的各种形势（英文）

本文分为四个章节。第一章是本论文的整体概括。简要讲述了美国的历史和现状,指出了文章的主要话题和目的。第二章和第三章是本文的主要组成部分。分析了美国在二十一世纪从国际、国内的角度,在经济、文化和政治领域所面对的挑战。第二章主要集中在美国国内在二十一世纪所面临和将要面对的挑战。因此我们将会看到面临的六个主要挑战。在第三章中,作者将从四个方面讨论美国面对国际挑战的措施。第四章是本文的结论。它将简要归纳要点,介绍了本论文的贡献和不足。

The Challenge of American in 21st Century

This paper will be divided into four chapters. The first chapter is the overall picture of this paper. It briefly talks about the historical and current situation of America,and the main topic and purpose of this paper. Chapter two and chapter three are the main parts of this paper. They analyze the challenges that America faces in the 21st century from the perspective of international and domestic,in the fields of economy,culture and politics. Chapter two mainly focuses on the domestic challenges that America is facing or will face in the 21st century. We will see six major challenges from this perspective. In the next chapter,the author will discuss the international challenges America faces in four as- pects. The fourth chapter is the conclusion of this paper. It will briefly summarize the main points of this paper,the contributions and shortcom- ings of this paper.