A few reasons:
There are a wide variety of different sounds humans could potentially make with their mouths. No language uses all of them. Learning to use the ones not used in your first language is challenging.
There are often sounds that aren’t used in combination in one language but are in another.
Many languages may use the same alphabet you’ve learned but the letters don’t always correspond to the same sounds. This adds extra confusion, even if you wouldn’t have had trouble learning the pronounciation of the word by ear.
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