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空 心的 : 47 phrases in 11 subjects |
| Agriculture | 4 |
| Architecture | 4 |
| Automobiles | 3 |
| Aviation | 1 |
| Bridge construction | 1 |
| Earth sciences | 1 |
| Electronics | 1 |
| General | 5 |
| Refrigeration | 1 |
| Surfing, windsurfing, SUP surfing | 1 |
| Technology | 25 |
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