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| 31. | barrel reflector |
| 炮膛反射镜 |
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| 32. | barrel extension |
| 炮管节套 |
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| 33. | barrel finishing |
| 滚筒抛光 |
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| 34. | 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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| 35. | barrel handling |
| 装卸油桶 |
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| 36. | barrel printing |
| 鼓式印刷 |
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| 37. | barrel radiator |
| 圆筒形散热器 |
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| 38. | lens barrel |
| 镜筒 |
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| 39. | barrel distortion |
| 【光】桶形变形﹝影像四边线条呈外弯线变形﹞ |
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| 40. | blasting barrel |
| 导火线套管 |
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