It is important for making good use of a textbook to study the null content.
教科书空无内容对教材编审、教材使用和师生教学都有重要启示。
参考来源 - 教科书的空无内容与教师的应对·2,447,543篇论文数据，部分数据来源于NoteExpress
The null content of a textbook means such a kind of content that should be contained in the textbook but not.
教科书的空无内容是教科书中应该呈现却没有呈现的内容。
The null content of a textbook means such a kind of content that should be contained in the textbook but not.
空无课程是指学校中应该有而没有的课程，教科书的空无内容是指教科书中应该呈现而没有呈现的知识。
In addition the queries which are sent to remote data sources are further optimized by the execution layer based on cache content and advanced null suppression logic.
另外，被发送到远程数据源的查询由执行层根据缓存内容和高级空抑制逻辑进行进一步优化。
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