aid to navigation中文什么意思

例句与用法

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1. The use of magnets as aids to navigation can be traced back at least to the eleventh century .
   磁铁用于航海，至少可追溯到11世纪。
2. The main dimensions of aids to navigation on inland waterways
   内河助航标志的主要外形尺寸
3. Trailered inter - coast waterway aids to navigation boats
   入海河口引航船
4. Pharos is an important aid to navigation for ships
   航标灯是江河与海洋上船只重要的助航标志。
5. The regulation for surface colours of the visual aids to navigation in china
   中国海区视觉航标表面色规定