"In observational studies, we often have to rely on assumptions that are not directly testable."
The only way to do great work is to love what you do
Leadership in forestry requires patience—like the trees we steward, real impact grows over time.
解析：金玉满堂，无法守藏；如果富贵到了骄横的程度，那是自己留下了祸根。
释义：水一旦泼出去，就收不回来，后悔也来不及。
The real question is not whether machines think but whether men do.
