私人飞行执照要求掌握小型飞机的无线电导航。
A private pilot's license gives you training in visual and radio navigation of a small plane.
一些公开源码执照要求由它派生出来的工作也必须作为公开源码提供。
Some open source code licenses require that derivative work incorporating that code must also be made available as open source.
商业飞行执照要求更灵活的掌握无线电导航及全球定位系统。
A commercial pilot's license requires you to learn how to use more sophisticated radio navigation and global positioning systems (GPS).
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