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| 21. | open shelter deck |
| 开式遮蔽甲板 |
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| 22. | light obscuration principle |
| 光线遮蔽原理 |
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| 23. | mask signal generator |
| 遮蔽信号发生器 |
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| 24. | occlude light;occlude the flow of blood. |
| 遮蔽光线；止血 |
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| 25. | electromagnetic signal masking |
| 电磁信号遮蔽 |
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| 26. | shelter deck steamer |
| 遮蔽甲板汽船 |
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| 27. | Semi-cutoff type , SC/O |
| 半遮蔽式 |
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| 28. | partial shelter deck |
| 部分遮蔽甲板 |
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| 29. | housed-in lifeboat |
| 遮蔽式救生艇 |
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| 30. | specified sheltered waters |
| 指明遮蔽水域 |
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