在数学中，没有捷径可走。
In mathematics, there are no shortcuts.
Sustainability is not an option; it's a necessity for the future of our planet.
Everyone is in favor of free speech. Hardly a day passes without its being extolled， but some people's idea of it is that they are free to say what they like， but if anyone else says anything back， that is an outrage.
如果你足够爱它，任何事物都会与你交谈。