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| 41. | The outer casing of a rocket, guided missile, or spaceship. |
| 外壳火箭，导弹或宇宙飞船的外壳 |
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| 42. | polymetal crust |
| 多金属结壳 |
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| 43. | protecting crust |
| 防护壳 |
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| 44. | A shell casing. |
| 贝壳外壳 |
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| 45. | subcontinental crust |
| 次大陆地壳 |
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| 46. | Laterite A hard crust that may form on the surface of the SOIL in tropical regions with alternating wet |
| 红土：在热带地区，土壤表面由于干湿交替而行成的具有坚硬外壳的一种土壤。 |
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| 47. | oceanic crust |
| 大洋地壳 |
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| 48. | taxicab exteriors |
| 出租车外壳 |
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| 49. | about the moon's mantle, that section of superheated rock which goes down hundreds of miles below the crust |
| 我们对月球地幔所知不多，那些过热的岩石在外壳几百英里以下。 |
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| 50. | drawn-shell case |
| 压制外壳 |
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