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| 观察〔检査，窥视，人〕孔; 光学瞄准器 | |||
| 观察孔; 窥视孔; 看火孔 | |||
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| 观察窥视孔 | |||
| 检视孔 | |||
| 视孔 | |||
| 检查孔; 窥视孔 | |||
| 窥视〔检査，瞄准，人〕孔 | |||
| 视察孔 | |||
| 观察孔 | |||
| 人孔; 验火孔; 窥火孔; 看火孔; 瞄准孔; 窺视孔; 检査孔 | |||
| sight-hole: 3 phrases in 2 subjects |
| Metallurgy | 2 |
| Technology | 1 |
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