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| 21. | hardened filter paper |
| 硬滤纸 |
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| 22. | work hardened steel |
| 加工硬化钢 |
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| 23. | work-hardened threads |
| 加工硬化的螺纹 |
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| 24. | fully hardened steel |
| 全硬化钢 |
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| 25. | water-hardened steel |
| 水淬钢 |
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| 26. | hardened steel ball |
| 淬火钢球 |
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| 27. | oil hardened stee |
| 油淬硬钢 |
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| 28. | hardened operator cab |
| 强固驾驶室 |
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| 29. | (British) hardened clay. |
| （英国英语）硬化的粘土。 |
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| 30. | hardened carbonate soil |
| 硬化碳酸盐土壤 |
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