Why do ラ (ra), リ (ri), ル (ru), レ (re) and ロ (ro) sometimes sound like they begin with a /d/ sound? And why are they used sometimes for an /l/ sound? - Видео

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Why do ラ (ra), リ (ri), ル (ru), レ (re) and ロ (ro) sometimes sound like they begin with a /d/ sound? And why are they used sometimes for an /l/ sound?