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| 照准标; 瞄准孔 (器) | |||
| 觇板; 照准仪 | |||
| 瞄准器; 照准板; 瞄准孔; 透视孔; 照准标; 视准标; 觇标 | |||
| sight vane: 2 phrases in 1 subject |
| Hydroelectric power stations | 2 |
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