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"In observational studies, we often have to rely on assumptions that are not directly testable."
失败不可怕,可怕的是失去从失败中学习的能力。
The more I study nature, the more I stand amazed at the work of the Creator.
世界称之为不道德的书籍,是那些展示了世界自身羞耻的书籍。