免费的疫苗比昂贵的治疗更有价值，但更难推广。
Free vaccines are more valuable than expensive treatments, yet harder to promote.
The artist's role is to be a bridge between the visible and the invisible, the said and the unsaid.
随机评估可以帮助我们了解发展中哪些措施有效，哪些无效。
我不在乎你怎么想，除非是关于我的。