全英文版：
There are many factors that can contribute to a person’s success in life. Whether he is at school or at work, a person is more likely to succeed if he is hard-working, honest, intelligent, responsible, and so on. But of all the possible characteristics that can affect one's success, I believe self-confidence to be the most important for the following reasons.
The first reason is that when a person has self-confidence he believes in himself. He believes that he can and will succeed, and this gives him the courage to try new things. In order to be successful we must be willing to take some risks, so having self-confidence is very important. Another reason is that a confident person rarely gives up. When he fails he tries again and again until he wins. A final reason is that confident people are not afraid to show off their achievements. This is not to say that they should brag, but that they should gracefully and confidently accept the compliments of others. When their achievements are noticed more by others at school or work, they are more likely to succeed. liuxuepaper.com
In short, I believe self-confidence to be the most important factor in success. It enables people to take risks, try again when they fail, and enjoy their accomplishments when they win. With these abilities, a confident person can succeed easily at school or work.
自信翻译
促成一个人成功的因素有很多。不论是念书或工作，如果可以努力、诚实、聪明、负责任等，就比较有可能成功。但在所有可能影响成功与否的特点中，基于下列理由，我认为自信最重要。 第一个理由就是，当一个人有自信的时候，就会相信自己的能力。他会相信自己可以而且一定会成功，这一点让他有勇气尝试新事物。想要成功，我们必须愿意冒险，所以有自信是很重要的。另一个理由是，有信心的人很少放弃，即使失败了，还是会不断尝试，直到成功。最后一个理由是，有信心的人不怕炫耀自己的成就，这并不表示他们应该自夸，而是应该优雅、有信心地接受别人的赞美。作文地带提供翻译
当他们在学业或工作上的成就更受人注目时，成功的可能性就更高了。 简言之，我认为自信是成功最重要的因素。自信使人勇于冒险，失败了会再接再厉，成功时能享受自己的成就。有了这些能力，有信心的人就能够轻易地在学业或工作上获得成功。
自信 self-confidence范文二，此文100字左右适合初中、高中生写。上文适合大学学历写。(作文地带提示您此文为上文的缩写版)
There are many factors that can contribute to a person’s success in life. But of all the possible characteristics that can affect one’s success, I believe self-confidence to be the most important for the following reasons.
The first reason is that when a person has self-confidence he believes in himself. He believes that he can and will succeed, and this gives him the courage to try new things. Another reason is that a confident person rarely gives up. When he fails he tries again and again until he wins. A final reason is that confident people are not afraid to show off their achievements. When their achievements are noticed more by others at school or work, they are more likely to succeed. From liuxuepaper.com
In short, I believe self-confidence to be the most important factor in success. A confident person can succeed easily at school or work.
自信
促成一个人成功的因素有很多。但在所有可能影响成功与否的特点中，基于下列理由，我认为自信最重要。
第一个理由就是，当一个人有自信的时候，就会相信自己的能力。他会相信自己可以而且一定会成功，这一点让他有勇气尝试新事物。另一个理由是，有信心的人很少放弃，即使失败了，还是会不断尝试，直到成功。最后一个理由是，有信心的人不怕炫耀自己的成就，当他们在学业或工作上的成就更受人注目时，成功的可能性就更高了。
简言之，我认为自信是成功最重要的因素。有信心的人能够轻易地在学业或工作上获得成功!
(建议：英语作文)