学习是系统中产生的任何变化,这种变化或多或少会永久性地改变其适应环境的能力。
To solve a mathematical problem is to uncover a piece of the universal puzzle.
I think scars are like battle wounds - beautiful in a way. They show what you've been through and how strong you are for coming out of it.
The only limits that exist are the ones you place on yourself.