对很多英语使用者来说，最“难学”的语言或许要数拉丁语了。

Perhaps the "hardest" language studied by many Anglophones is Latin.

youdao

在这书中，他引入阿拉伯数系于拉丁语国家。

In his book, he introduced the decimal number system to the Latin-speaking world.

youdao

在这书中，他引入阿拉伯数系于拉丁语国家。

In his book, he introduced the decimal number system to the Latin-speaking world.

youdao