air base navigational aids 机场导航设备
short distance navigational aids 近距导航设备
navigational aids and bridge system 导航设备及驾驶室系统符号
navigational aids with disorder operation 航标失常
air navigational radio aids 航空无线援助施设
The crash was a direct result of inadequate navigational aids.
坠机是导航不力的直接后果。
Today I want to talk about the importance of stars for early seafarers, about how the fixed patterns of stars were used as navigational aids.
今天我想谈谈恒星对早期航海者的重要性，以及恒星的固定模式是如何被用作助航工具的。
These virtual folders serve only as organizational and navigational AIDS.
这些虚拟资料夹只有提供组织性和巡览性的辅助。
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