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| |||
| down-cast; air heading | |||
| upcast | |||
| downcast | |||
| air pit | |||
| |||
| upcast | |||
| |||
| downcast | |||
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通 风坑 : 14 phrases in 8 subjects |
| Agriculture | 1 |
| Architecture | 1 |
| Construction | 1 |
| Electric machinery | 2 |
| Engineering geology | 1 |
| General | 1 |
| Metallurgy | 1 |
| Technology | 6 |
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