The mind can be considered as a physical symbol system.
贪婪读书，终生学习，保持好奇，日日增慧。
At twenty-one, I was a divorced single mother. At thirty, I was struggling to feed my children. At forty, I was starting over in a new country. At fifty, I was rebuilding my career. At sixty, I walked the runway at Fashion Week. Life begins at every age—if you dare to make a plan.
The fight against viruses is a battle of wits between nature and human ingenuity.
科学的旅程不仅仅是寻找答案，更是提出正确的问题。