我想买一本关于中国历史的外文书。

Wǒ xiǎng mǎi yì běn guānyú Zhōngguó lìshǐ de wàiwénshū.

I want to buy a foreign-language book about Chinese history.

她每天听外文歌曲来练习发音。

Tā měitiān tīng wàiwén gēqǔ lái liànxí fāyīn.

She listens to foreign songs every day to practice pronunciation.