"Matching methods can be a powerful tool when randomization is not possible."

造纸行业有责任在环境管理方面引领潮流。

The market, like the Lord, helps those who help themselves. But unlike the Lord, the market does not forgive those who know not what they do.

The biggest risk is not taking any risk. In a world that's changing quickly, the only strategy that is guaranteed to fail is not taking risks.

灵魂应该总是半开着，准备迎接狂喜的体验。

Don't let the noise of others' opinions drown out your own inner voice.