The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.
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。
The time at our disposal each day is elastic; the passions we feel dilate it, those we inspire contract it; and habit fills up what remains.
"The truth is rarely pure and never simple."
Literature is a false representation of life that helps us to understand life better.