Paper can be permanent if you respect its characteristics and design accordingly.
如果你尊重紙的特性并相應(yīng)設(shè)計，紙也可以是永久的。
The future of energy lies in diversification—no single source will meet all our needs.
A miner's safety should never be measured in cost-benefit analyses.
對于系統(tǒng)，翻版的模擬是在控制圖中添加一個創(chuàng)建循環(huán)的邊，而不僅僅是一個附加節(jié)點。
地球是一個動態(tài)的物體，其表面在不斷變化。