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| 21. | a fissure in the earth's crust (or in the surface of some other planet) through which molten lava and |
| 喷发熔化的火山岩和气体的地球外壳（或是其他行星的表面）的裂缝。 |
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| 22. | Mountains also play an important role in stabilizing the crust of the earth.4 They hinder the shaking |
| 同时,山也起着稳定地球外壳的重要作用。4它们阻止地球晃动。 |
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| 23. | crust movement |
| 地壳移动 |
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| 24. | The following are step-by-step instructions for the crust, half of which goes in the bottom of the pie |
| 下面教你怎样一步步做苹果饼的外壳.这个外壳的一半用来馅饼底,另一半用来做馅饼的盖子. |
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| 25. | lateritic crust |
| 砖红壤结壳 |
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| 26. | unfaulted crust |
| 未断裂地壳 |
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| 27. | earth crust |
| 地壳 |
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| 28. | weathering crust |
| 风化壳 |
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| 29. | geographical crust |
| 地理壳 |
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| 30. | calcareous crust |
| 钙质壳 |
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