history的形容词形式怎么写

例句：

It was a new era in the history of our country.

这是我国历史上的`一个新纪元。

I have a history class at 9 o'clock.

我9点钟有历史课。

She used her family's history as a base for her novel.

她以她的家族史作为小说的素材。

We won't talk about that ─ that's history.

我们不会谈论那件事的——那都已经过去了。

She's writing a new history of Europe.

她正在写一部新的欧洲史。