2 sentences

1. 那个书呆子根本不了解现实社会的复杂性。

   nà gè shū​dāi​zi gēn​běn bù liǎo​jiě xiàn​shí shè​huì de fù​zá​xìng.

   That nerd doesn't understand the complexity of real society at all.

   Source: Dong Chinese Dictionary

2. 他从小就是个书呆子，整天躲在房间里看书。

   tā cóng xiǎo jiù shì gè shū​dāi​zi, zhěng​tiān duǒ zài fáng​jiān lǐ kàn shū.

   He has been a bookworm since childhood, hiding in his room all day reading.

   Source: Dong Chinese Dictionary