A promise is a promise.
要信守承诺。
I've learned that you can't control everything, but you can control how you react to it.
The past is always tense, the future perfect.
如果人类不能在我有生之年登陆火星,我将会非常失望。
"La verdadera poesía no se escribe con palabras, sino con el silencio que las rodea."
自然的简单性不应以我们概念的简单性来衡量。
The future of petrochemical industry lies in sustainable development.