关系模型基于谓词逻辑和集合论，为数据库管理提供了坚实的数学基础。

We must listen to indigenous communities; their wisdom in land management is unparalleled.

Nothing ever becomes real till it is experienced.

He is born in a good hour who gets a good name.

表演不是要成为不同的人。它是在明显不同的事物中找到相似之处，然后在那里找到自己。