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| 21. | Copper turns green as it weathes. |
| 铜暴露在自然环境中就变绿。 |
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| 22. | A natural environment or locality. |
| 一个自然环境或地点 |
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| 23. | natural ambient level |
| 自然环境的悬浮固体水平 |
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| 24. | 1823年门罗主义：美国总统詹姆斯·罗发表一番演讲确定美国在未来欧洲的冲突中将保持中立立场。 |
| Monroe Doctrine: US President James Monroe delivers a speech establishing American neutrality in future European conflicts. |
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| 25. | physical capacity of the natural environment |
| 自然环境物质负荷能力 |
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| 26. | our physical environment; an opportunity for children to examine the physical world around them. |
| 我们的自然环境；孩子们的一个调查他们周围自然环境的机会。 |
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| 27. | preservation of the natural environment |
| 对自然环境的保护 |
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| 28. | disguise by camouflaging; exploit the natural surroundings to disguise something. |
| 假装；使用自然环境掩饰某物。 |
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| 29. | natural environmental stress |
| 自然环境压力; 自然环境问题 |
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| 30. | The natural environment for the survival of children has improved. |
| 儿童生存的自然环境得到改善。 |
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