i learned to play the piano from 7 years old to 13years old ,表明学了几年钢琴,是6年还是7年?

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ilearnedtoplaythepianofrom7yearsoldto13yearsold,表明学了几年钢琴,是6年还是7年?ilearnedtoplaythepianofrom7yearsold

i learned to play the piano from 7 years old to 13years old ,表明学了几年钢琴,是6年还是7年?
i learned to play the piano from 7 years old to 13years old ,表明学了几年钢琴,是6年还是7年?

i learned to play the piano from 7 years old to 13years old ,表明学了几年钢琴,是6年还是7年?
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