Have you seen babies? They need years to learn to speak properly. But the list of sound we use regularly is much smaller than the list of sound our mouth is capable of making.
Simply put, they are CAPABLE of making these sounds. They just don’t know how. The R sound doesn’t exist in chinese. The closest is L. Or rather a sound that is a mix of L and R. And most people don’t spend month trying to learn how to make a sound they don’t plan on using their whole life.
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