請問這句英語中的某段是什麼短語?

題目：

請問這句英語中的某段是什麼短語?
He helped popularize the idea that some diseases not previously thought to have a bacterial cause were actually infections,which aroused much controversy when it was first suggesed.
這段話中的「 some diseases not previously thought to have a bacterial cause」 屬於什麼類型的短語?

解答：

在that引出的從句中,diseases是主語,由some修飾,後面又有定語短語修飾,是由原來的定語從句省略而成的,原來的定語從句時這樣寫的：some diseases that were not previously thought to have a bacterial cause.指所以省略,就是爲了避免出現兩個that及其引出的兩個從句,而且句子變簡練後,也顯得層次更高.
你之要熟悉後,多點留意觀察和模仿,以後自己也能寫出這樣漂亮的句子了.