The present is a point just passed.
地质时间不仅漫长，而且其事件的发生是不规则的。
Sustainability is not an option, it's a responsibility.
If you don’t take risks, you’ll never know what you’re capable of.
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。