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| bit bumping | |||
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位 压 缩 : 17 phrases in 9 subjects |
| Air defense | 1 |
| Automobiles | 3 |
| Bridge construction | 1 |
| Desert science | 1 |
| Electronics | 2 |
| Refrigeration | 1 |
| Space | 3 |
| Surgery | 1 |
| Technology | 4 |
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