HSK 6
Yìzhù zhǐchū, zhège cíyǔ zài yuán yǔyán zhōng yǒu tèshū hányì.
The translator's note points out that this word has a special meaning in the original language.
HSK 7-9
Shū zhōng yǒu duō chù yìzhù, jiěshì le yuánwén de wénhuà bèijǐng.
The book has many translator's notes explaining the cultural background of the original text.