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。
The heart breaks and breaks and lives by breaking.
最伟大的建筑来自于倾听 - 倾听土地,倾听人民,倾听社区的需求。
"The essence of mathematics is not to make simple things complicated, but to make complicated things simple."