降低成本的最好方法是一开始就没有成本。
The best way to reduce costs is to not have them in the first place.
坚持住,成功就在下个路口等你。
科学是一种思维方式,远不止是一堆知识。
"I don't think of my work as being for children or for adults. I just think of it as being."