我很荣幸能有机会在这里做演讲，和大家谈谈这给我们健康和生活带来不好影响的灰霾天气。
I feel it a great honor to have a chance to give a speech here, talking about the haze weather, which causes lots of bad effects on our health and life.
很荣幸能站在这里进行演讲，我演讲的题目是《我们就是世界》。
It is my great honor to stand here and giving the speech on the title of: We are the world.
很荣幸能站在这里发表演讲，我的题目是如何安排学习时间。
It's my honor to stand here to give you a speech, the title of my speech is how to manage our study time.
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