Firstly, the original language characteristics of poetry retrogressed and displacement appeared.

首先，诗歌本质特征整体退化，发生了位移。

But in the later period of Liao Dynasty, its legal systems retrogressed a lot and many achievements obtained in the beginning were lost.

但是到了后期，其法制却出现了大的倒退，遭到严重破坏，前期取得的成果丧失殆尽。