Quality fruit starts with quality soil - we must care for the foundation of all growth.

里氏替换原则是面向对象编程中的一个基本概念，确保派生类可以替代其基类使用，而不会改变程序的正确性。

Innovation is the key to transforming the mining sector into a force for global progress.

我正在学习如何爱自己。