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forthandback‘或者‘large and by’。

youdao

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forthandback‘或者‘large and by’。

youdao