Age is one of the important factors which affects the second language acquisition.Since the critical period hypothesis has already been applied to study second language acquisition,though it was originally proposed to study the first language acquisi⁃tion,it has arisen many controversies.Some researchers home and abroad hold the view that age plays a critical role in learning a second language,while others point out that there is no close relationship between the age and second language acquisition.The au⁃thor will first briefly introduce the research situations about the critical period hypothesis.Then discuss the age’s influences on second language acquisition.At last,give some suggestions and advice on second language teaching and make a conclusion.
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机译：基于无脊椎仙人掌的哺乳奶牛日粮中的棉籽粕替代豆粕替代品subst f f f f f base base base base base base base base base base base base base base base base base base base base base base base base base base base lact
机译：metodi microbiologici Tradizionali e metodi moleculeolari per l'analisi degli integratori alimentari a base di o con probiotici per ujso umano（microbiological and molecular methods for analysis of probiotic Based Food supplements for Human Consumption）。
