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."
建筑是一门视觉艺术，建筑物会自己说话。
数学不是一项观赏性运动。你必须亲自去做才能理解它。
只有那些冒险走得太远的人才能发现一个人能走多远。
Quality begins at the farm, and excellence is built through every step of the supply chain.