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| air door; trapdoor | |||
| loop-hole door; trap door | |||
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通气门 : 18 phrases in 8 subjects |
| Automobiles | 5 |
| Aviation | 4 |
| Business | 1 |
| Electronics | 1 |
| General | 1 |
| Space | 2 |
| Technology | 3 |
| Textile industry | 1 |
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