containing or having everything that is needed within itself

The apartment is small, but completely self-contained, with its own bathroom, kitchen, and living area. 公寓很小，但完全独立，拥有自己的浴室、厨房和起居空间。

A self-contained person does not have a large number of relationships with other people or does not depend on others for support.

She's very self-contained and isn't at all worried about moving to a big city where she won't know anybody. 她非常独立，对于要搬到一个举目无亲的大城市去一点儿都不担心。