儿童书籍应该既挑战又安慰。
Children's books should challenge as well as comfort.
代数分析是所有科学中最广泛和最确定的;它是唯一具有不变和可靠方法的一门科学。
就像虎的外形好画,虎的骨骼难画一样,人的外表好认,人心却难了解。
Monetary policy is 98% talk and 2% action.
To understand the arithmetic of algebraic varieties is to understand the symmetries hidden within them.