基本的韵律感和音高感是音乐教师的必备素质。
A basic sense of rhythm and pitch is essential in a music teacher.
因此，文件上载是web门户的一种基本的必备功能。
Therefore, file upload is a basic and necessary function of Web portals.
摘要信息素养是科学素养的重要方面，也是现代教师必备的基本素养之一。
Information attainments have turned into a basic qualification for teachers as well as an important foundation of scientific attainments.
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