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| clamshell type gate | |||
| clamshell type door; fan-shaped door; fan-shaped gate | |||
| fan gate; gate sector; sector gate | |||
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| clamshell type gate; sector gate | |||
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扇形门 : 30 phrases in 6 subjects |
| Agriculture | 1 |
| Architecture | 1 |
| Ecology | 1 |
| Hydroelectric power stations | 4 |
| Metallurgy | 1 |
| Technology | 22 |
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