医学的艺术在于在自然治愈疾病时逗乐病人。
Power is not a means; it is an end. One does not establish a dictatorship in order to safeguard a revolution; one makes the revolution in order to establish the dictatorship.
煤炭的未来取决于我们创新和减少其环境影响的能力。
The magical number seven, plus or minus two: some limits on our capacity for processing information.