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URL：https://static.wixstatic.com/media/5aae66_e89e283999f84cefb0ff3f7e521480d7~mv2.png/v1/fill/w_707,h_222,al_c,lg_1,q_85,enc_avif,quality_auto/無声化練習 発音１.png 掲載元：https://www.jp-lab.com/vowel-devoicing-practice
