Heard melodies are sweet, but those unheard are sweeter.
旋律是很美妙的，但听不见的会更美。
A man is a dangerous thing, a man who has nothing to lose is even more dangerous.
Efficiency in resource use isn’t just good for the planet—it’s good for business.
The best way to predict the future is to create it.
我们无法选择时代，但我们可以选择如何回应它。
今天对技术的投资将决定我们未来提供更清洁能源的能力。
教学的艺术是帮助发现的艺术。