俗话说，好的开始是成功的一半(Well begun is half done)，一个好开头对于一篇
开头的几句背景介绍，要点是出场不能太生硬，就和表白一样，需要先搭上话，然后再表态才合适(这个比喻好像不太恰当，但是意思你懂的)，所以我们需要先从一个角度切入，然后再分析表立场。切入方法多种多样，却也常常可抽象为”在某某情况下，存在某某情况”，可参考的写法如下：
1. 从经济角度切入：
例句a：With the growth of economy and the improvement of living standard, city residents are paying more attention to the relation between the economic growth and environment protection.
例句b：With ampler supplies of commodities in the market, consumers are enjoying more choices today.
2. 从社会角度切入：
例句a：As our society is advancing, people’s demands have become increasingly diversified.
例句b：Freedom of the press is widely considered as a fundamental citizenship right in the modern society.
3. 从科技应用方面切入：
例句a：As computers are widely used in all aspects of the national economy, they have effectively improved our work efficiency, exchange of information, and coordination of resources.
例句b：Automobiles, serving as an effective means of transportation, have found a wide application in modern cities.
4. 从时间切入：
例句a：Tracing back to my school years, teachers used to give us a heavy load of homework.
例句b：Before entering adulthood, teenagers should be familiar with some practical knowledge that helps them establish a rational view on money.
例句c：A familiar scene would come into people's mind whenever the cinema is mentioned: comfortably seated before the wide silver screen, the audiences are experiencing the vivid visual effects and the amazing sound effects produced by the advanced equipment installed in the cinema.
5. 从空间方面切入：
例句a：In today's increasingly vigorous job market, two-way selection has become a most typical mode of employment.
例句b：In many big cities, there are many young people who like to buy their groceries online and have them delivered to their homes. Why has it become so popular?
6. 从视角切入
例句a：In the eyes of many students, teachers boast absolute authority in education.
例句b：From the medical perspective, it is widely acknowledged that children's brains are the quickest to assimilate new knowledge and thus this stage of life lays the foundation for their future education.
7. 从道理/观念切入
例句a：Real-life experience has taught us that plans are easy to make, yet extremely difficult to follow through with.
例句b：There exists a popular notion that a person can be judged by the friends they make.
8. 从重要性/意义切入
例句a：Stepping into adulthood marks the beginning of a brand new stage of one's life. It also means numerous encounters with challenges that may have never shown up during the golden years of childhood. In the face of such a reality, many responsible parents attempt to help their teenage children adapt to future challenges as early as possible.
例句b：Urban transportation has always been a focused concern of governments. The overwhelming pressure on the major streets in rush hours causes an undesirable waste of time and energy.
写背景句的方法绝不仅限于以上几种，all roads lead to Rome，希望以上几种方法能打开你的思路，让你在