In mathematics, you don't understand things. You just get used to them.
安全不是成本——它是對(duì)我們最寶貴資源（人）的投資。
國(guó)家不是一個(gè)慈善機(jī)構(gòu)；它是一個(gè)強(qiáng)制組織。
Collaboration between industry and government is essential to meet our climate goals.