无论我们承认与否，过去始终与我们同在。
"The past is always with us, whether we acknowledge it or not."
The joy of solving a mathematical problem is unparalleled; it is a moment of pure intellectual triumph.
Sometimes the hardest thing and the right thing are the same.
自然定律相对于参考系变换的对称性是物理学最基本的原理之一。
"In the end, we are all just stories, told by others and ourselves."
"Time is a thief, but it's also a giver. You just have to be willing to see the gifts."
一切都有价值，只要灵魂不渺小。
The PAC learning framework provides a formal way to analyze the efficiency and effectiveness of learning algorithms.