Economics is the study of how societies use scarce resources to produce valuable goods and services and distribute them among different individuals. If we think about the definitions, we find two key ideas that run through all of economics:
科学史上充满了这样的例子：将两组技术、两组思想，在追求新真理的过程中相互接触，会带来丰硕的成果。
Knowledge can be shared, but wisdom cannot. It must be discovered and lived.
Education is the foundation upon which sustainable forestry is built.
Don’t ever respond to a solicitation or a proposal on the phone. The urgency is a disguise.
The more you love yourself, the more you can give love to others.