Bilingualism refers to a linguistic situation in which two standard languages are used either by an individual or by a group of speakers, such as the inhabitants of a particular region or a nation.
A bilingual community is such a community in which its members commonly and regularly use two languages in their daily lives. And a typical example of a bilingual community is an ethnic ghetto where most, if not all, of its inhabitants are either immigrants or children of immigrants.
Most bilingual communities have one thing in common, thar is, a fairly clear functional differentiation of the two languages in respect of speech situations known as domain.
Thus in bilingual communities, one language may be used in some domains, such as the Home Domain and another language in other domains, such as the Employment Domain.
双语是指一个人或一组讲话者（如某一地区或某一国家的居民）使用两种标准语言的一种语言状态。
双语社区就是这样一个社区，其成员在日常生活中经常使用两种语言。双语社区的一个典型例子是少数民族聚居区，那里的大多数（如果不是全部）居民要么是移民，要么是移民的子女。
大多数双语社区都有一个共同点，即“域”，这是两种语言在语言环境方面的功能分化。
因此，在双语社区，一种语言可用于某些领域，如家庭领域，另一种语言可用于其他领域，如就业领域。
