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| 51. | Barrel Bar |
| 条夹板 |
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| 52. | conventional barrel |
| 常规取心筒 |
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| 53. | leaching barrel |
| 浸出桶 |
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| 54. | barrel enameling |
| 转鼓涂 |
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| 55. | barrel converter |
| 卧式转炉 |
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| 56. | laminated barrel |
| 薄片卷成的枪管 |
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| 57. | conductor barrel |
| 导线筒 |
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| 58. | Barrel tumbling |
| 滚筒打光 |
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| 59. | launcher barrel |
| 发送筒 |
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| 60. | barrel throttle |
| 筒形节流阀 |
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