| 1. | Two atoms of hydrogen combine with one atom of oxygen to form a molecule of water. |
| 两个氢原子和一个氧原子结合而形成一个水分子。
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| 2. | Water is composed of the elements hydrogen and oxygen. |
| 水是由氢元素和氧元素组成的。
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| 3. | Hydrogen is highly explosive. |
| 氢极易爆炸。
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| 4. | A molecule of water consists of two atoms of hydrogen and one atom of oxygen. |
| 水分子含有两个氢原子和一个氧原子。
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| 5. | Hydrogen and oxygen are gases. |
| 氢和氧都是气体。
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| 6. | Hydrogen and oxygen combine/Hydrogen combines with oxygen to form water. |
| 氢与氧化合成水。
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| 7. | Water is composed of hydrogen and oxygen. |
| 水是由氢和氧化合而成的。
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| 8. | 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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| 9. | 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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| 10. | The first bubbles to escape from the liquid are a mixture of air and hydrogen . |
| 从该液体中最先逸出的气泡是空气和氢的混合物。
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