在观察性研究中，我们常常不得不依赖于无法直接检验的假设。
"In observational studies, we often have to rely on assumptions that are not directly testable."
Responsible mining is about leaving a positive legacy for the communities we operate in.
I'm a survivor, I'm not gonna give up, I'm not gonna stop, I'm gonna work harder.
I guess it comes down to a simple choice:get busy living or get busy dying.
The best investment you can make is in yourself.
The important thing in science is not so much to obtain new facts as to discover new ways of thinking about them.
If liberty means anything at all, it means the right to tell people what they do not want to hear.