我不去改掉你的语言,只是做一些细节上的小小的修改
A-- 3 foreigner Professor (应该是foreign professor 但是最好不这样说,这样显得不够礼貌)你可以把这句话跟后面一句连起来.
Today,we are honored and happy to have 3 (可以加special 或者)Professors(可以把 Academy of Social Science省略掉)with us.
They are (应该加from)Singapore Academy of Social Science,A;UK Academy of Political and Social Science,B;US Academy of Political and Social Science,C.
B-- Let's welcome (加them)with warm applause.
C--Ok,now,(可以说first of all) 'ok,now'可以用在第二位演讲教授得前面/
D--每个教授讲完后的总结性发言可以换一些其他词汇,例如wonderful之类/
最后,我认为你的结束语还有待于改善/