Clean the seal on the fridge door regularly so that it remains airtight.
定期清洁冰箱门上的密封垫,可以使它保持密闭。
A. Place the rescuer's mouth over the infant's nose and mouth, forming an airtight seal.
抢救者口封住患儿鼻,口,形成一密闭气道。
Applicable to petrochemical container, seal airtight installation such as pump, valve, etc.
适用于石油,化工容器,机泵,阀门密封装置。
Mix all oils together and pour mixture into a storage jar made of glass with an airtight seal.
全部浇油混合在一起,混合成储藏罐不透气的密封玻璃制成。
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