This is not transliteration. This is phonic adoption. See article for actual definition. Your last example was transliteration:
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This is not transliteration. This is phonic adoption. See article for actual definition. Your last example was:
radio => ラジオ (''ra-ji-o'') (RAH DEE OH)
radio => ラジオ (''ra-ji-o'') (RAH DEE OH)
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Again, this is phonetic adaptation. Japanese does not reproduce the English spelling radio. It represents an approximation of its pronunciation using katakana.