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Second Language Acquisition / Phonetics / Multilingualism / Psychoacoustics / Speech perception / English / Speech Acoustics / Korean linguistics / Face recognition (Psychology) / English Phonetics and Phonology / Adolescent / Multidisciplinary / Cross Linguistic Studies / Bilingualism / Language Transfer / Humans / Female / Male / Young Adult / Korean language / Voice Quality / Adult / Time Factors / Acoustic Stimulation / English / Speech Acoustics / Korean linguistics / Face recognition (Psychology) / English Phonetics and Phonology / Adolescent / Multidisciplinary / Cross Linguistic Studies / Bilingualism / Language Transfer / Humans / Female / Male / Young Adult / Korean language / Voice Quality / Adult / Time Factors / Acoustic Stimulation