用英语翻译：他对中国历史了解很好

He has a good knowledge of Chinese history.

have a good knowledge of : understand something well.

you had a good command of Chinese history

he is good at chinese history

楼主以后可以靠自己

推荐楼主使用工具：
http://www.google.cn/language_tools?hl=zh-CN

意思是：

He very good understanding of Chinese history

He knows well about Chinese history.

He has a keen sense of Chinese history