The English alphabet was adopted from the Romans, which does not have a separate letter to represent each sound in the language so that some letters must do double duty or work together in combination. 

英语字母表来自罗马体。它没有一个单独的字母来代表语言中的每个音，因此一些字母必须起双重作用或结合起来使用。

故答案为Romans。