a particular environment or walk of life同义词：sphere, area, orbit, field, arena
territory over which rule or control is exercised同义词：demesne, land
the set of values of the independent variable for which a function is defined
people in general; especially a distinctive group of people with some shared interest同义词：world
a knowledge domain that you are interested in or are communicating about同义词：region, realm
例句
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
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。
Military history is really outside my domain.我对军队史实在一窍不通。
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。
详细解释
do.main n.（名词）A territory over which rule or control is exercised.领土：被统治或控制的领地A sphere of activity, concern, or function; a field:领域：活动、思想、功能等领域；范围：例句：the domain of history.See Synonyms at field 历史领域参见 field Physics Any of numerous contiguous regions in a ferromagnetic material in which the direction of spontaneous magnetization is uniform and different from that in neighboring regions.【物理学】 磁场：磁铁中自发磁化方向一致而与相邻区域自发磁化方向不同的一种紧邻区Law【法律】 The land of one with paramount title and absolute ownership.领土：具有最高所有权或绝对所有权的土地Public domain.国有土地Mathematics【数学】 The set of all possible values of an independent variable of a function.定义域：函数自变量的所有可能值的集An open connected set that contains at least one point.域：至少含有一个点的开通连集 来源：French domaine 法语 domaine blend of Old French demaine from Late Latin dominicum 混合了 古法语 demaine 源自 后期拉丁语 dominicum Latin dominium [property] 拉丁语 dominium [财产] both from dominus [lord] * see dem- 都源自 dominus [老爷] *参见 dem-