The market portfolio is efficient if and only if all investors hold mean-variance efficient portfolios.
当且仅当所有投资者都持有均值-方差有效的投资组合时，市场组合才是有效的。
"The truth is rarely pure and never simple."
We want to build a Google that works for everyone.
The future of transportation is electric, and we’re all in.
家具的未来在于将传统与尖端技术相结合。
Innovation is not just about creating new products; it's about reimagining how we solve problems.
学习就像种树，春天赏花，秋天收获果实；讨论文章如同春天的花，修养身心、付诸实践才是秋天的果实。