资本资产定价模型是一个简单而强大的工具,用于理解风险与回报之间的关系。
You can't please everyone, so don't try.
弦理论的数学美感表明它必须是自然界终极描述的一部分。
The central task of education is to implant a will and facility for learning; it should produce not learned but learning people. The truly human society is a learning society, where grandparents, parents, and children are students together.