头脑需要书才能保持敏锐,就像剑需要磨刀石。
A mind needs books as a sword needs a whetstone if it is to keep its edge.
有两类公司,一种公司为提高价格而工作,一种公司为降低价格而工作。我们会成为第二种。
The goal of mathematics is to understand the structures that underlie the phenomena we observe.