The challenges of today's coal industry require bold leadership and vision.
当今煤炭行业的挑战需要大胆的领导力和远见。
释义：他强调空气密度对于物质形态的决定性作用，认为物质的形态和性质都受到空气密度的影响。
法律与道德的分离是法律体系存在的必要条件。
The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.
美好的社会是美德得到回报的社会。