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URL：https://images.squarespace-cdn.com/content/v1/662bdd6fa6de576465d75a02/1714150771581-K2T2CLVV1BEWRE7VS6TS/letter r.jpg 掲載元：https://www.thespeechlanguagecenter.org/blog/articulation-series-the-r-sound-lwe52-fy8yr
