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51. | dirty formation |
| 含泥质地层 |
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52. | galaxy formation |
| 星系形成 |
|
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53. | group formation |
| 群体形成 |
|
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54. | laminar formation |
| 层状地层 |
|
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55. | index formation |
| 标准建造 |
|
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56. | ketal formation |
| 酮缩醇的形成 |
|
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57. | class formation |
| 类构造 |
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58. | lamella formation |
| 薄板形成 |
|
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59. | aggregate formation |
| 团集体形成 |
|
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60. | Lance Formation |
| 兰斯组 |
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