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| 鼓形闸门; 圆筒形闸门 | |||
| 弧形转动闸门; 圆闸门; 圆阀 (门); 滚筒式闸门 | |||
| 鼓轮门 | |||
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drum gate : 8 phrases in 3 subjects |
| Electronics | 1 |
| Hydroelectric power stations | 3 |
| Technology | 4 |
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