The word order is fixed which means that you can't say 'forth and back' or 'large and by'.

固定语序意味着这两个单词的顺序不能更换，也就是说你不能说forth and back‘ 或者‘large and by’。

youdao

English is a fixed-word-order language where each phrase has a fixed position.

英语是一种“词序固定”的语言，这种语言的特点就是每个短语都有固定的位置。

youdao