Free vaccines are more valuable than expensive treatments, yet harder to promote.
模型的目的是足够简单以便理解和使用,但又足够复杂以捕捉系统的基本特征。
In the field of diplomacy, there are no absolute victories, only relative victories.
When hitchhiking, look like the person you want to pick you up.
Every performance is a chance to connect with the audience in a unique way.
"O escritor é um contador de histórias, mas também um criador de mundos."