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| 41. | hard impervious material |
| 坚硬不透水物料 |
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| 42. | step foot on land. |
| 走上陆地 |
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| 43. | terrestrial biota |
| 陆地生物 |
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| 44. | hard rock country |
| 坚硬岩石地区 |
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| 45. | a land biologist |
| 陆地生物学家 |
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| 46. | sound rock |
| 坚硬的岩石 |
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| 47. | terminal sclereid |
| 末端坚硬细胞 |
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| 48. | A jaw of flint. |
| 坚硬的颚 |
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| 49. | The hailstone is strong and hard. |
| 雹块坚硬 |
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| 50. | competent barrier |
| 坚硬遮挡层 |
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