Psychology must be based on direct experience and introspection.
心理学必须建立在直接经验和内省的基础上。
Sustainability isn't an option; it's a responsibility we owe to future generations.
The truth is, I don't know what I would have done without mathematics.
Art is not what you see, but what you make others see.
柴油发动机可以使用植物油作为燃料,这将极大地促进使用该技术的国家的农业发展。