单词'thou'是一个在现代英语中很少使用的古语。

The word '___thou' is an ___archaism rarely used in modern English.

这部历史剧的服装设计采用了大量古风元素，以营造真实的古代氛围。

The costume design in this historical drama employs many ___archaisms to create an authentic ancient atmosphere.