数学是给不同事物赋予相同名称的艺术。
如果你感觉自己在走过地狱。走着别停。
释义：圆的器物容易滚动，而方的器物则易于停止，这是器物的差异；金属刚硬而水则柔弱，这是它们的物性不同。
With a library you are free, not confined by temporary political climates. It is the most democratic of institutions because no one - but no one at all - can tell you what to read and when and how.
"The most successful companies are those that put their customers first."