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| sublayer | |||
| subsurface layer; through layer | |||
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次表层 : 20 phrases in 9 subjects |
| Agriculture | 1 |
| Earth sciences | 1 |
| Electronics | 1 |
| Hydroelectric power stations | 1 |
| Management | 1 |
| Oil / petroleum | 1 |
| Project management | 1 |
| Space | 2 |
| Technology | 11 |
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