Main.ToStudyEnglishIsSoonerTheBetter History

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May 14, 2013, at 05:54 AM by 123.230.176.32 -
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critical period hypothesis

http://ci.nii.ac.jp/naid/110008665460

http://ci.nii.ac.jp/naid/110004999353

http://ci.nii.ac.jp/naid/110004626040

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