这本书的内容不太容易理解。

Zhè běn shū de nèiróng bù tài róngyì lǐjiě.

The content of this book is not very easy to understand.

天气变化很容易影响人的心情。

Tiānqì biànhuà hěn róngyì yǐngxiǎng rén de xīnqíng.

Changes in the weather can easily affect people's moods.

学外语不容易，但是每天学习一点就会有进步。

Xué wàiyǔ bù róngyì, dànshì měitiān xuéxí yìdiǎn jiù huì yǒu jìnbù.

Learning a foreign language is not easy, but if you study a little every day, you will make progress.