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| 底座; 窑炉底砖 | |||
| 下滑轮; 包底大块砖; 炉底大块砖; 包底大砖; 炉底大砖 | |||
| 带钩滑轮; 窑底砖; 池底大砖 | |||
| bottom block: 16 phrases in 3 subjects |
| Automobiles | 1 |
| Metallurgy | 3 |
| Technology | 12 |
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