Every lump of coal we mine keeps the lights on in someone's home.

当你认识到这个世界上的美好时，你就不再是奴隶了。

The best technology is the one that solves real problems.

The language of mathematics is universal; it transcends all cultural barriers.

我们不需要魔法来改变世界，我们内心已经拥有所需的力量。