I'm very proud to be black, but black is not all I am. That's my cultural historical background, my genetic makeup, but it's not all of who I am nor is it the basis from which I answer every question.

The decay of political institutions is often a result of the inability to adapt to changing circumstances, leading to rigidity and eventual decline.

PID控制器是控制工程师的通用工具，适用于各种各样的过程。