研读陈亚平教授讲座：【外研社·U讲堂社区】10月20日 语言学习的有效机制，外显学习和内隐学习探析 ，思考以下问题：It is postulated that younger learners are probably more successful in informal and naturalistic learning contexts, and older learners are more successful in formal instructional settings. Do you agree or disagree? Why or why not?

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Watch the video SLA-Theories_Input Interaction Output.

Answer the following questions: 

Drawing on the English teaching and/or learning in your past experience,  what roles do input and output play in the process? How effective are input and output in your teaching/learning?