段落的主题句对主题的限定主要是通过句中的关键词来表现的。关键词要尽量写得具体些。对“具体”的要求包括两个方面：一是要具体到能控制和限制段落的发展;二是要具体到能说明段落发展的方法。
大学生经典英语演讲稿范文一：
What College Education Means to Me
The title of my speech is “What college education means to me”.Now reflecting on the past two and half years of my college experience, I come to realize how much it has shaped me.
For me, college education is a marvelous ship-builder who designed me from kneel plates up.
With great vision, college education has equipped me, first with a powerful propeller----the sophisticated knowledge in certain field and wide exposure to other disciplines. By dedicating myself to the engineering courses in the day and immersing myself in the rich banquet of the world literature at night, I’ve amassed the driving force for the future and enriched my soul.
Besides, college education has also provided me with a precise compass----the sense of social responsibility. How can I best serve the interest of the public while achieving my self-fulfillment? My one year’s experience as a part-time English teacher has testified: to be valuable to society as well as to find my place, I have to possess some actual strength and the ability to function well in the most challenging situation. Amid the hectic schedule that balances club activities, sports, and academic courses, I feel the rhythm and beauty in the intensity of my high-pitched life, knowing that I ’m on the right way.
And more importantly, college education has set up not only single ships, but also fleets with common destinations. By interacting with friends of common beliefs, I’ve acquired skills of relating to other people.
Now ,as a ship about to make my maiden voyage ,I’m still not in the position to tell what’s waiting ahead of me ,but with a powerful propeller, a precise compass and ardent companions of sailing in the sea of society, I’m ready to be a great sea-explorer.
Thank you.
大学教育对我的意义
今天我演讲的题目是“大学教育对我的意义”。回顾思索着逝去的两年半的大学生活，我渐渐认识到大学教育对我产生的巨大影响。
对我来说，大学教育犹如一位技艺精湛的造船师，从船头至船尾地塑造了我。
首先，具有远见卓识的大学教育为我装配了一只马力强劲的推进器;精深的专业知识及广博的课外知识给我带来无限动力。白天我全神贯注地研习自己的工科课程，晚上则尽情享受世界文学所带来的盛宴，在此过程中，我既为未来积聚了力量，又充实了自己的灵魂。
此外，大学教育还为我提供了一个精确的罗盘，即社会责任感。“如何才能在实现自我价值的同时最大限度地服务于社会?”我一年的兼职英语教师的经历证明：只有拥有过硬的实力和对高挑战性局面应付自如的能力，我才能成为一个对社会有价值的人，一个找到自己位置的人。在协调着社团活动、体育运动和专业课程的忙碌日程中，我感受到了高节奏、高密度生活的韵律与美丽。
更为重要的是，大学教育不仅仅制造了一只只单个的船只，他还组建了一支支驶向同一目的地的大舰队。在与志趣相投的朋友们的相处、融合中，我锻炼了与人交往的能力。
现在我即将作为一只巨轮开始我的首航，尽管前方的情况还无法预料，我却有充足的信心作一名出色的海洋探索者，因为我有强劲的推进器、 精确的罗盘，还有一帮与我同行 、一起驶向社会之洋的热心朋友!
大学生经典英语演讲稿范文二：
The Importance of Keeping Optimistic
Honourable judges, ladies and gentlemen,
Good afternoon! Today I would like to talk about the importance of keeping optimistic. When we encounter difficulties in life, we notice that some of us choose to bury their heads in the sand. Unfortunately, however, this attitude will do you no good, because if you will have no courage even to face them, how can you conquer them? Thus, be optimistic, ladies and gentlemen, as it can give you confidence and help you see yourself through the hard times, just as Winston Churchill once said, “An optimist sees an opportunity in every calamity; a pessimist sees a calamity in every opportunity.”
Ladies and Gentlemen, keeping optimistic, you will be able to realize, in spite of some hardship, there’s always hope waiting for you, which will lead you to the ultimate success. Historically as well as currently, there are too many optimists of this kind to enumerate. You see, Thomas Edison is optimistic; if not, the light of hope in his heart could not illuminate the whole world. Alfred Nobel is optimistic; if not, the explosives and the prestigious Nobel Prize would not have come into being. And Lance Armstrong is also optimistic; if not, the devil of cancer would have devoured his life and the world would not see a 5-time winner of the Tour De France.
A rose may be beautiful, or maybe not; that depends on your attitude only, and so does success, so does life. Hindrances and difficulties do exist, but if you are optimistic, then they are only episodes on your long way to the throne of success; they are more bridges than obstacles! Now I prefer to end my speech with the great British poet Shelley’s lines: “If winter comes, can spring be far behind?” Thank you!
保持乐观的重要性
尊敬的评委、女士们、先生们：
下午好!今天我想谈一谈保持乐观的重要性。 我们注意到，当在生活中遇到困难时，我们中的有些人选择逃避它们。但令人遗憾的是，这样的态度对你没有任何好处，因为如果你连面对它们的勇气都没有的话，你怎么去征服它们呢?因此，乐观起来吧，女士们、先生们，因为它会带给你信心，帮助你渡过难关。正如温斯顿·丘吉尔所说，“乐观者在每次灾难中都看到机遇;悲观者在每次机遇中都看到灾难”。
女士们，先生们，困难是存在的，但如果你保持乐观，你就会意识到永远有希望在等着你，它会把你领向最终的成功。不管是历史上还是现实中，这样的乐观者总是不胜枚举。你看，托马斯·爱迪生是乐观的，如果不是的话，他心中那希望的明灯就不能照亮整个世界;阿尔弗雷德·诺贝尔是乐观的，如果不是的话，那炸药和享有很高声望的诺贝尔奖就不会诞生;兰斯·阿姆斯特朗也是乐观的，如果不是的话，那癌症的病魔早已吞噬了他的生命，这个世界就会少了一位五届环法自行车赛冠军得主.
玫瑰花可能很美，也可能不美，这，仅仅取决于你的态度;而成功也如此，人生也如此。困难和阻碍的确存在，但是如果你很乐观的话，那它们就仅仅是我们通向胜利之冠的漫长道路上的小插曲;与其说它们是障碍，不如说它们是桥梁!此刻，我想以伟大的英国诗人雪莱的一句诗来作为我的结尾：“冬天来了，春天还会远吗?”谢谢!