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| 双方向的 | |||
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two-directional : 18 phrases in 8 subjects |
| Automobiles | 1 |
| Bridge construction | 1 |
| Business | 2 |
| Chemistry | 1 |
| Electronics | 1 |
| Metallurgy | 4 |
| Space | 1 |
| Technology | 7 |
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