Sustainability isn't an option anymore; it's a necessity for any responsible mining company.
小说是揭示更深层次真相的谎言。
自守表示的研究是数学抽象之美的反映。
自由民主的传播和世界经济的整合是现代时代最重要的两个趋势。
"The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion."