중장년층 3대 질환과 콜라겐의 관계
B2 Korean listening practice · Korean · Curated for upper-intermediate learners
A 4:23 video in Korean at B2 level, suitable for upper-intermediate learners. The speech is at a natural pace around 133 words per minute, rated 2.4/5, medium listening difficulty by Reelang’s algorithm.
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