我一看到蝙蝠就把门闩上了。I had bolted the door the instant I had seen the bat.在中国，蝙蝠被视为吉祥物。In China bats are thought of as being very lucky.大多数蝙蝠靠回声定位来飞行。Most bats navigate by echolocation....
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...