| 11. | She died from lack of oxygen . |
| 她缺氧致死。
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| 12. | Oxygen masks are used in aircraft only in emergencies. |
| 飞机上的氧气面具只用于紧急情况。
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| 13. | They placed the child in an oxygen tent when he had difficulty in breathing. |
| 那孩子呼吸困难时,他们把他放进氧幕里。
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| 14. | Water is a compound containing the elements hydrogen and oxygen . |
| 水是含有氢和氧元素的化合物。
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| 15. | Oxygen and hydrogen are the essential elements to constitute water. |
| 氧和氢是构成水的基本元素。
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| 16. | Oxygen enters into many compound bodies. |
| 氧是许多化合物的组成部分。
|
| 17. | Water may be resolved into oxygen and hydrogen. |
| 水可以分解成氧和氢。
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| 18. | The lungs absorb oxygen from the air and give the blood the oxygen it needs and relieve it of carbon dioxide. |
| 肺从空气中吸入氧气，为血液提供所需要得氧气，并帮助排除二氧化碳。
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| 19. | Oxygen is present in the air. |
| 空气中有氧气。
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| 20. | Hydrogen combines with oxygen to from water. |
| 氢和氧化合生成水。
|