If a place or piece of equipment has built-in objects, they are permanently connected and cannot be easily removed.

built-in storage 嵌入式储物间

UK All the rooms have built-in cupboards/wardrobes. 所有的房间都安装了嵌入式壁橱／衣橱。

A built-in quality is an original part of something or someone and cannot be separated from it, him, or her.

a built-in advantage/problem 内在的优势／固有的问题