挑战在于让不可见的东西变得可见。

Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.

"The past is always with us, but it doesn't have to define us."

Simplicity is not the absence of complexity, but the resolution of it.

反馈是一个强大的概念，在自然系统和技术系统中被广泛使用。