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| 31. | tumbling barrel |
| 滚光筒 |
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| 32. | barrel reflector |
| 炮膛反射镜 |
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| 33. | lens barrel |
| 镜筒 |
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| 34. | tailstock barrel |
| 顶针套|床尾轴|尾架轴 |
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| 35. | 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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| 36. | powder Barrel |
| 可能导制战争的国际争端 |
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| 37. | blasting barrel |
| 导火线套管 |
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| 38. | starting barrel |
| 起始岩芯管 |
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| 39. | Barrel vault |
| 筒拱 |
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| 40. | rumbling barrel |
| 清理滚筒 |
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