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| 41. | approach-to-obstacle marking |
| 近障碍物线 |
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| 42. | isolated danger buo |
| 孤立障碍物浮标 |
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| 43. | Something that obstructs; an obstacle. |
| 阻塞物；障碍物 |
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| 44. | obstacle free zone |
| 无障碍物区 |
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| 45. | observation of navigation obstruction |
| 航行障碍物探测 |
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| 46. | be hemmed about by obstacles |
| 被障碍物团团围住. |
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| 47. | obstacle avoidance test |
| 绕过障碍物试验 |
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| 48. | back echo reflection |
| 障碍物回波反射 |
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| 49. | Obstruction approach marking |
| 近障碍物标线 |
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| 50. | clean anchorage |
| 无障碍物锚地 |
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