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| 71. | concentrated refinery liquor |
| 浓缩提炼液 |
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| 72. | scrap and pig process |
| 生铁废钢炼钢法 |
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| 73. | opium processing centre |
| 鸦片提炼中心 |
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| 74. | It is very brittle and difficult to work . |
| 生铁很脆，很难加工。 |
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| 75. | uranium extraction facility |
| 铀提炼设施 |
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| 76. | extraction and metallurgy of thorium |
| 钍的提炼 |
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| 77. | rendering industry |
| 提炼与加工工业 |
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| 78. | puddled pig iron |
| 搅炼炉用生铁 |
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| 79. | vacuum hot extractio |
| 真空加热提炼 |
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| 80. | pig iron containing a substantial proportion of slag. |
| 含有大量矿渣的生铁。 |
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