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地板下 : 93 phrases in 11 subjects |
| Architecture | 2 |
| Automobiles | 29 |
| Aviation | 2 |
| Construction | 2 |
| Drilling | 1 |
| Electronics | 2 |
| General | 1 |
| Hydroelectric power stations | 2 |
| Refrigeration | 1 |
| Technology | 48 |
| Telecommunications | 3 |
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