domain

sphere, domain, field, territory, province

这些名词均含“范围，领域”之意。
sphere: 指有明显分界线的范围或领域，强调彼此不会干扰、跨越，各不相关。
domain: 指知识艺术、兴趣或人类活动的领域。
field: 主要指经选定在一段时间内作专题研究的方面或领域，含夸张意味。
territory: 指科学知识、活动等的领域或范围。
province: 即可指科学、艺术、学问的领域或范围，又可指个人或机关职权的管辖范围。

名词 domain:

1. a particular environment or walk of life
   同义词：sphere, area, orbit, field, arena
2. territory over which rule or control is exercised
   同义词：demesne, land
3. the set of values of the independent variable for which a function is defined
4. people in general; especially a distinctive group of people with some shared interest
   同义词：world
5. a knowledge domain that you are interested in or are communicating about
   同义词：region, realm

1. A set of values of a function corresponding to a particular subset of a domain.
   像，像点函数中与某一集合中特定变量相对应的变量
2. As soon as you create an account for the user, the user can participate in a secure domain.
   一旦您为用户创建了一个帐号，用户就可以进入安全域中。
3. Military history is really outside my domain.
   我对军队史实在一窍不通。
4. The kitchen is my wife's domain, she doesn't like me going into it.
   厨房是我妻子的领地，她不愿让我进去。