认为有一个钟声会告诉投资者何时进入或退出股市的想法根本不可信。
The idea that a bell rings to signal when investors should get into or out of the stock market is simply not credible.
What good's an opinion if you can't change it?
谷物生产的创新不仅关乎技术，更关乎思维方式的转变。