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."
对于好的建议，唯一能做的就是传递它。它对自己从来没有任何用处。
A writer's duty is to disturb the peace, to question the unquestionable, to challenge the status quo.
让我们团结起来，为国家的独立和人民的自由而战。
The future is no longer what it was.