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| 11. | The road be freeze hard . |
| 路冻得坚硬。 |
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| 12. | sound rock |
| 坚硬的岩石 |
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| 13. | competent barrier |
| 坚硬遮挡层 |
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| 14. | hard impervious material |
| 坚硬不透水物料 |
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| 15. | The hailstone is strong and hard. |
| 雹块坚硬 |
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| 16. | surface areas of solid |
| 固体表面积 |
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| 17. | As solid as stone |
| 坚硬如石 |
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| 18. | A jaw of flint. |
| 坚硬的颚 |
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| 19. | hard rock country |
| 坚硬岩石地区 |
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| 20. | state equation of solids |
| 固体状态方程 |
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