The study of language learnability is not oriented to whether language is learnable but to explaining how the language acquisition device does its work.
语言可学性研究不是关于语言是否可以被学得，而是试图解释语言习得机制完成习得任务的方式。
He believes that people acquire a language once the 'comprehensible input' penetrates the affective filter and reaches the learner's innate language Acquisition Device (LAD).
他认为只有当可理解输入通过情感过滤进入学习者的语言习得机制时，人们才能习得这种语言。
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