英语释义
1
n a particular geographical region of indefinite boundary (usually serving some special purpose or distinguished by its people or culture or geography)
3
n a part of an animal that has a special function or is supplied by a given artery or nerve
4
n a particular environment or walk of life
5
n a part of a structure having some specific characteristic or function
6
n the extent of a 2-dimensional surface enclosed within a boundary