Noun / Pronoun + 里面
里面 (lǐmiàn) means "inside" or "within" and is used to indicate that something is contained in or part of a larger whole. It can refer to physical spaces or abstract groups and categories.
书包里面有三本书和一支笔。
Shūbāo lǐmiàn yǒu sān běn shū hé yī zhī bǐ.
Inside the backpack there are three books and a pen.
冰箱里面还有一些牛奶,你自己拿吧。
Bīngxiāng lǐmiàn hái yǒu yīxiē niúnǎi, nǐ zìjǐ ná ba.
There's still some milk in the fridge — help yourself.
这个团队里面有不少经验丰富的工程师。
Zhège tuánduì lǐmiàn yǒu bùshǎo jīngyàn fēngfù de gōngchéngshī.
This team has quite a few experienced engineers in it.