This is the 9878th most frequent Japanese word.
訳す
To translate.
The verb '訳す' is used to indicate the act of translating text from one language to another.
彼はその詩を英語に訳した。
He translated the poem into English.
Here, '訳す' is paired with 'のは' to state the act of translating is challenging.
この本を訳すのはかなり難しいでしょう。
Translating this book will likely be quite difficult.
The word '訳す' is in its volitional form '訳そう' to indicate an intention or attempt to translate a sentence.