La palabra es el arma más poderosa que tenemos para cambiar el mundo.
The dead are always looking down on us, they say. But we don't look back.
有时候最有力的时刻是那些未说出口的时刻。
Every sentence is a journey, and every word is a step.
A philosophical problem has the form: "I don't know my way about."
向一个人展示他在错误中是一回事，让他掌握真理是另一回事。
投资新技术不是可选的，而是能源未来的必要条件。