"Every book is a door to another world, and every reader is a traveler."
品牌向上是自主品牌的必由之路。
I never guess. It is a capital mistake to theorize before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts.
在每个问题中,都有一个等待被发现的隐藏模式,作为数学家,我们的责任就是去揭示它。