有时候最简单的想法是最有力的。
Your work is going to fill a large part of your life, and the only way to be truly satisfied is to do what you believe is great work.
有时候,你必须和你爱的人分开,但这并不会让你爱他们少一点。有时候,这会让你更爱他们。
"In observational studies, we often have to rely on assumptions that are not directly testable."