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B1 Intermediate Korean 1:51 Educational

뼈 무게 줄이고 귀 퇴화…바닷속 고래의 비밀 / YTN 사이언스

YTN 사이언스 · 5,546 views · Added 3 months ago

Learning Stats

B1

CEFR Level

5/10

Difficulty

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