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| 41. | starting barrel |
| 起始岩芯管 |
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| 42. | lens barrel |
| 镜筒 |
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| 43. | pork barrel |
| [美俚]议员为讨好选民而私给地方的金钱或位置 |
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| 44. | rumbling barrel |
| 清理滚筒 |
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| 45. | blasting barrel |
| 导火线套管 |
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| 46. | tumbling barrel |
| 滚光筒 |
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| 47. | Barrel vault |
| 筒拱 |
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| 48. | tailstock barrel |
| 顶针套|床尾轴|尾架轴 |
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| 49. | powder Barrel |
| 可能导制战争的国际争端 |
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| 50. | extruder barrel |
| 挤出机料筒 |
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