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41. | in-motion waterline |
| 航行水线 |
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42. | flight schedule |
| 航行时刻表 |
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43. | surface navigation |
| 水面航行 |
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44. | commercial navigatio |
| 商业航行 |
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45. | navigation monitor |
| 航行监测仪 |
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46. | shipping kilometre |
| 航行里程 |
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47. | navigational clearance |
| 航行限界 |
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48. | island reef navigation |
| 岛礁航行 |
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49. | navigational ranging |
| 航行测距 |
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50. | commercial shipping |
| 通商航行 |
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