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• ▶ [ShadowingBook] How does heart transplant surgery work? | TED-Ed ShadowingKorean.com쉐도잉코리안 · 2022.06.26
• ▶ [ShadowingBook] What is the rarest color in nature? | TED-Ed ShadowingKorean.com쉐도잉코리안 · 2022.06.22

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