1.he is too well known to require my introduction.他太有名了，而不需我作介绍。
2.i want to welcome you all to the world peace symposium.欢迎大家参日世界和平研讨会。
3.mr. smith is so famous that any introduction would be superfluous.史密斯先生名气很大，任何介绍都是多余的。
4.it is my pleasure to introduce the keynote speaker for tonight, dr. smith.很荣幸介绍今晚演讲的..