| 1. | Too much oxygen can also block regeneration .
过多的氧也可阻碍再生。
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| 2. | Red cells ferry oxygen throughout the body .
红血球将氧气运送到全身。
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| 3. | Mars is too dry and poor in oxygen .
火星上面过于干燥，并且缺乏氧气。
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| 4. | Mercury is too dry and poor in oxygen .
水星过于干燥并且缺乏氧气。
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| 5. | Mars is too dry and poor in oxygen .
火星过于干燥，而且缺乏氧气。
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| 6. | Water is composed of hydrogen and oxygen .
水由氢与氧化合而成。
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| 7. | Water consists of hydrogen and oxygen .
水由氢和氧二元素合成。
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| 8. | Atom number eight is called oxygen .
原子序数为8的物质叫做氧。
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| 9. | He first filled the drum with oxygen .
他首先将桶里充满氧气。
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| 10. | The oxygen hood is a clear, sturdy dome;
氧气头盔是一个透明而牢固的圆顶帽。
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