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| single action door | |||
| unilateral gate | |||
| baffle gate; single-acting door; single-action door; single-swing door | |||
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单向门 : 29 phrases in 6 subjects |
| Aviation | 17 |
| Cryptography | 1 |
| Electronics | 1 |
| Hydroelectric power stations | 2 |
| Space | 2 |
| Technology | 6 |
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