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| guard gate | |||
| protective door; shielding door | |||
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| explosion door | |||
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防护 门 : 15 phrases in 8 subjects |
| Automobiles | 5 |
| Aviation | 1 |
| Business | 1 |
| Earth sciences | 1 |
| Electronics | 1 |
| Engineering geology | 1 |
| Hydroelectric power stations | 1 |
| Technology | 4 |
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