适合四六级考试和常规英语考试作文
方法很简单，学起来超级快，无论什么考试作文都适用。
第一段：Background+论点+加三个支撑的论据。
第二段：第一个论据。展开描述。
第三段：第二个论据。展开描述。
第四段：第三个论据。展开描述。
最后一段：总结（重申论点论据）+思考。
要求：每一段不少于五个句子，学会用衔接词，比如first，inadditon，toconclude等等！这些能让文章更加有逻辑。
这一篇的主题是找一个官方定义的学术名词，然后按照自己理解重新定义。
以下为本人原创，勿抄袭。
原文如下：
Dopamine is a neuromodulatory molecule that plays several important roles in cells. It is an organic chemical of the catecholamine and phenethylamine families. Dopamine constitutes about 80% of the catecholamine content in the brain. In my personal view, the secretion of dopamine produces emotions such as nervousness, happiness and excitement. Therefore, the definition of dopamine in my mind is the substance produced when I read interesting books, fall in love and play computer games.
To begin with, dopamine is the substance produced when I read interesting books. When I read my favorite books, such as Harry Potter, A Dream of Red Mansions and Journey to the West. I am deeply attracted by the vivid and interesting stories in the book. I can learn a large number of knowledge and broaden my horizons from these books. I feel so enjoyable and relaxed during my reading, and I believe this feel is the dopamine.
In addition, dopamine is the substance produced when I fall in love. Happiness and surprises would arise when my girlfriend bought me all sorts of things like electric toothbrushes, new clothes and some cute and funny handmade gadgets. Comfort would be generated when she always took care of me when I was sick and encourages me when I was upset. Nervousness and excitement would be created once I held hands and kissed with my girlfriend.
Finally, dopamine is the substance produced when I play computer games. When I am tired from studying or working, playing computer games for a while can make me happy and relaxed. I particularly love the themes of computer game about adventure, team cooperation and shooting such as League of Legends and Cross Fire. I am passionate about playing these games with my teammates and wining the games in the end. From my point of view, dopamine is being secreted in this moment.
To conclude, my personal definition of dopamine is the substance produced when I read interesting books, fall in love and play computer games. Dopamine seems to be a good substance making us happy and excited. There are also a variety of activities we can do to produce dopamine. However, studies have demonstrated excessive dopamine secretion will damage our physical health. Therefore, we need to control it well and not become addictive.
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