“密闭的”用英语怎么说

脱粒的湿玉米可以安全地贮存在密闭的贮藏设备里.Wetshelled corn can be safely stored in air - tight storage units.为什么在密闭的啤酒瓶里看不到气泡?Why are there no bubbles visible in a capped bottle of beer?在密闭的房间 、 矿井或竖井内施工,必须保证足够的通风.Duringapplication in close...