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simultaneous bilingualism
Simultaneous bilingualism is a form of bilingualism that takes place when a child becomes bilingual by learning two languages from birth. According to Annick De Houwer, in an article in ''The Handbook of Child Language'', simultaneous bilingualism takes place in “children who are regularly addressed in two spoken languages from before the age of two and who continue to be regularly addressed in those languages up until the final stages” of language development.〔De Houwer 1996, sec. 3.〕 Both languages are acquired as first languages. This is in contrast to sequential bilingualism, in which the second language is learned not as a native language but a foreign language.
==Prevalence==
It is estimated that half of the world is functionally bilingual, and the majority of those bilinguals are 'native speakers' of their two languages.〔Wölck 1987, p. 9.〕 Wölck has pointed out that there are many "native bilingual communities", typically in South America, Africa, and Asia, where "monolingual norms may be unavailable or nonexistent".〔Wölck 1987, p. 9.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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