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| 11. | "Nitrogen fixation Any natural or industrial process that causes free nitrogen in the air to combine chemically with other elements to form more reactive nitrogen compounds such as ammonia, nitrates, or nitrites." |
| 固定氮: 使空气中富含的不活泼气体－－游离氮与其它元素化合而生成较活泼化合物的自然或工业过程。 |
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| 12. | Wise and active |
| 聪明活泼 |
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| 13. | reactive hydrogen atom |
| 活泼氢原子 |
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| 14. | Not readily reactive with other elements; forming few or no chemical compounds. |
| 惰性的与其它元素反应不活泼的；不能形成或很少能形成化合物的 |
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| 15. | reactive intermediate |
| 活泼中间体 |
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| 16. | active molecule |
| 活泼分子 |
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| 17. | vivid shapes |
| 造型活泼 |
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| 18. | Lively and playful; frisky. |
| 活泼的活泼的、好玩的；活跃的 |
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| 19. | lively design |
| 款式活泼 |
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| 20. | quaternary compound |
| 季化合物； 四元化合物 |
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