这部词典的注释很专业，对学习者特别有帮助。

Zhè bù cídiǎn de zhùshì hěn zhuānyè, duì xuéxízhě tèbié yǒu bāngzhù.

The notes in this dictionary are very professional and especially helpful for learners.

如果没有这些历史背景的注释，你很难理解作者真正的用意。

Rúguǒ méiyǒu zhèxiē lìshǐ bèijǐng de zhùshì, nǐ hěn nán lǐjiě zuòzhě zhēnzhèng de yòngyì.

Without these notes on the historical background, it would be hard for you to understand the author’s real intention.