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."
故事永远不会结束；它只是停止。
The more you dream, the more you achieve.
The world is full of magic things, patiently waiting for our senses to grow sharper.
Language is the only tool we have to make sense of the world, and yet it is always inadequate.