Every problem in mathematics is an opportunity to learn something new.
數(shù)學(xué)中的每一個(gè)問(wèn)題都是學(xué)習(xí)新東西的機(jī)會(huì)。
In business, if you're not moving forward, you're falling behind.
能源的未來(lái)在于平衡傳統(tǒng)資源和可再生發(fā)展。
I want to liberate America from fear. I want people to be afraid of the things that are really scary, like war and famine, not their neighbor because he has a different religion.