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| depth bound | |||
| 深 限度: 28 phrases in 10 subjects |
| Agriculture | 4 |
| Bridge construction | 2 |
| Cryptography | 1 |
| Earth sciences | 1 |
| General | 1 |
| Geophysics | 1 |
| Hydroelectric power stations | 1 |
| Oil / petroleum | 2 |
| Technology | 14 |
| Transport | 1 |
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