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41. | Marginal principle |
| 边际原则 |
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42. | marginal inscription |
| 版铭 |
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43. | marginal intelligence |
| 边缘智力 |
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44. | marginal species |
| 边缘种 |
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45. | marginal moraine |
| 边缘冰碛 |
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46. | marginal placenta |
| 有缘胎盘|边缘胎座 |
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47. | marginal oilwell |
| 边际油井 |
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48. | marginal prospects |
| 边际矿区 |
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49. | marginal operation |
| 边缘操作 |
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50. | marginal strike |
| 边际产量发现井 |
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