1. 自给的;独立自足的
    You can describe someone or something as self-contained when they are complete and separate and do not need help or resources from outside.

2. (住宿场所)设施齐全的，独门独户的
    Self-contained accommodation such as a flat has all its own facilities, so that a person living there does not have to share rooms such as a kitchen or bathroom with other people.

1. constituting a complete and independent unit in and of itself

    e.g. the university is like a self-contained city with shops and all amenities

2. in full control of your faculties

    e.g. the witness remained collected throughout the cross-examination
           perfectly poised and sure of himself
           more self-contained and more dependable than many of the early frontiersmen
           strong and self-possessed in the face of trouble

    Synonym: collectedequanimouspoisedself-collectedself-possessed