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。

我不是为了钱而跑。我是为了对这项运动的热爱而跑。

Collaboration across borders isn’t optional—it’s essential for global aquaculture.

A Book of Verses underneath the Bough, A Jug of Wine, a Loaf of Bread—and Thou Beside me singing in the Wilderness— Oh, Wilderness were Paradise enow!