What a man can be, he must be. This need we call self-actualization.
They just keep trotting back and forth across the bridge thinking there is something better on the other side. If they'd hang head down at the top of the thing and wait quietly, maybe something good would come along. But no—with men it's rush, rush, rush, every minute. I'm glad I'm a sedentary spider.
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。
所以发表言论有三条准则,哪三种准则呢？第一是审查本质,第二是推理情理,第三是用于实践。
The future of farming lies in smart agriculture.