生活就像一辆十档变速自行车，我们有各种档位选择，很多人却忘了用。
Climate change is one of the biggest challenges of our time, and we must take action now.
The most expensive thing in the world is trust. It can take years to earn and just a matter of seconds to lose.
To do things with words is not a special kind of doing， but a special kind of speaking.
证明是一种用于使他人相信数学陈述为真的工具。
Sustainability is the only path forward for aquaculture—without it, we risk losing more than just profits.