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大母音推移 - Wikipedia https://ja.wikipedia.org/wiki/%E5%A4%A7%E6%AF%8D%E9%9F%B3%E6%8E%A8%E7%A7%BB#/media/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:Great_Vowel_Shift.svg