在英文中，通常在開頭就直接寫“This is to certify that .....”或“It is hereby certified that......”,即為“特此證明”之意。
原諒我的英文也不好。。。只知道最后一句

I hereby certify that retrieval of knowledge in the performance of the race good谷歌翻譯的

I have wongderful performance during competition in the literature search of knowledge,   hereby certify.

要是寫簡歷或者別的材料，可以這樣說：I had excellent performance during the knowledge contest of document retrival, hereby prove.
也可以簡單地說:Excellent performance during the knowledge contest of document retrival, hereby prove，

I have an excellent performance on knowledge contest of literature search, which is hereby certified.