The tenth and the last chapter are dificult to understand的to有什么用

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Thetenthandthelastchapteraredificulttounderstand的to有什么用Thetenthandthelastchapteraredificulttounderst

The tenth and the last chapter are dificult to understand的to有什么用
The tenth and the last chapter are dificult to understand的to有什么用

The tenth and the last chapter are dificult to understand的to有什么用
be difficult to是固定搭配.

be difficult to do是固定词组

这里,你记住,这里的to do 结构也就是动词不定式,它是表目的的