boon
heat retention
conservation de la chaleur ; maintien de la chaleur ; rétention de chaleur
이 보온병은 뜨거운 물을 오랫동안 유지해 줍니다.
i boonbyeong-eun tteugeoun mul-eul oraetdongan yujihae jum nida.
This thermos keeps hot water for a long time.
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