第二语言习得：Second Language Acquisition /SLA 。当然，也有人成为第二语言获得，或者第二语言悉得。天涯上曾经有一篇著名的英语学习方法及其误区分析的帖子，就主张翻译为第二语言悉得。用专业术语来说，第二语言习得是应用语言学的一个分支学科，研究对象主要是人类学习第二语言的过程及其结果，目标是对学习者的语言能力和交际能力进行客观描述和科学解释。
早期的二语习得理论被看作是普通的外语教学的附庸，并未受到足够的重视，只是被看做提高教学质量的一种工具而已。大约是在二十世纪六十年代末，第二语言习得才正式独立为一门学科受到重视。现在的第二语言习得研究概括说来论及三大领域，也就是中介语研究，学习者内部因素研究和学习者外部因素研究。
根据维基百科上的解释，第二语言习得被看做：
Second language acquisition or second language learning is the process by which people learn a second language in addition to their native language(s). "Second language acquisition" refers to what the learner does; it does not refer to what the teacher does (see "language education" for work on language teaching). "Second language acquisition research" studies the psychology and sociology of the learning process. Sometimes the terms "acquisition" and "learning" are not treated as synonyms and are instead used to refer to the subconscious and conscious aspects of this process respectively (see second language learning). --维基百科英文版第二语言习得词条
稍后我会在日志中进一步介绍这个理论。总之，这个理论对大家“学习”英语非常有帮助。
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