hwangibeop
ventilation method
méthode de ventilation ; technique de ventilation
환기법을 사용하여 실내 공기를 깨끗하게 유지하세요.
hwan-gi-beob-eul sayonghayeo silnae gonggireul kkaekkeuthage yujihaseyo.
Use the ventilation method to keep the indoor air clean.
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