The coldest winter I ever spent was a summer in San Francisco.

可持续林业不是成本，而是对我们未来的投资。

You are not only responsible for what you say, but also for what you do not say.

科学方法是统一且不可分割的，处理生命物质的科学与处理无机物质的科学方法相同。

企业家是一切运转的枢纽。