您要查找的是不是：
- oxygen impermeable mask 不透氧掩模
- An oxygen mask will come down from overhead in case of an emergency. 若发生紧急情况，头顶上会降下一只氧气面罩。
- If air is needed, the oxygen mask in the plane will pop down by itself. 如果空气缺乏，飞机内的氧气面罩会自动放下。
- Water contains hydrogen and oxygen. 水含有氢和氧。
- He wore a mask so that no one should recognize him. 他戴了一个面罩，使别人认不出他来。
- The passenger grabbed for the oxygen mask. 这个乘客夺取了氧气面罩。
- Oxygen enters into many compound bodies. 氧是许多化合物的组成部分。
- Sham is sham and the mask must be stripped off. 假的就是假的，伪装应当剥去。
- He tried to mask his disappointment with a smile. 他试图以微笑来掩饰他的失望。
- The mask fitted tightly over his face. 他用面具把脸蒙得严严的。
- They did so under the mask of charity. 他们是打着慈善的幌子这么做的。
- Mars is too dry and poor in oxygen. 火星上面过于干燥，并且缺乏氧气。
- Water is composed of hydrogen and oxygen. 水由氢和氧组成。
- Fish take in oxygen through their gills. 鱼通过鳃摄取氧气。
- The oxygen react vigorously with the impurity in the iron. 氧气与铁中的杂质发生剧烈的化学反应。
- Such feelings tend to remain submerge beneath a mask of social politeness. 在社交礼貌的掩盖下，这样的情感往往不会显露出来。
- A usually impermeable substance used for caulking. 堵塞材料用于堵缝的通常不渗透的材料
- The oxygen workshop caught fire and set off a chain of explosions. 氧气车间着了火，引起了一连串的爆炸。
- Plants can absorb carbon dioxide and release oxygen. 植物可以吸收二氧化碳释放氧气。
- The passage became absolutely impermeable. 过道完全不通了。
