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| 防护挡潮闸; 保险锁 | |||
| 防护闸; 挡潮闸 | |||
| 入口船闸; 挡潮闸 (门); 潮汐船闸; 防护闸 (门); 防洪闸 (门); 保安联动 | |||
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guard lock : 4 phrases in 3 subjects |
| Automobiles | 1 |
| Hydroelectric power stations | 2 |
| Technology | 1 |
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