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| stratified | |||
| irregular | |||
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复层的 : 18 phrases in 8 subjects |
| Aviation | 1 |
| Drilling | 3 |
| Electronics | 1 |
| General | 1 |
| Geophysics | 2 |
| Mining | 6 |
| Space | 1 |
| Technology | 3 |
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