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薄 冰 : 31 phrases in 9 subjects |
| Agriculture | 3 |
| Automobiles | 1 |
| Earth sciences | 1 |
| General | 4 |
| Hydroelectric power stations | 2 |
| Mountaineering | 1 |
| Pharmacology | 1 |
| Refrigeration | 1 |
| Technology | 17 |
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