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| 观察，射击，窥视，墙，气孔; 炮眼; 装货，舱,射击口; 钻头出水孔; 舷窗; 汽门孔道 | |||
| 采光通风口 | |||
| 检査孔; 圆形眩窗口 | |||
| 窥视孔 | |||
| 开口 | |||
| 孔; 口; 隙; 洞; 气孔 | |||
| 观察口; 舷窗 | |||
| 观察窗 | |||
| 检查孔; 观察孔 | |||
| 舷孔; 孔口; 看火孔; 墙孔; 汽门; 钻头的水槽; 装货口; 舱口; 放映孔 | |||
| porthole: 12 phrases in 5 subjects |
| Metallurgy | 4 |
| Nautical | 1 |
| Refrigeration | 1 |
| Space | 1 |
| Technology | 5 |
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