Our derivative knowledge always depends upon some pure a priori knowledge and usually also depends upon some pure empirical knowledge.
我们的衍生知识总是依赖于一些纯粹的先验知识，通常也依赖于一些纯粹的经验知识。
英语百科
Empirical evidence
（重定向自Empirical knowledge）
Empirical evidence, also known as sense experience, is a collective term for the knowledge or source of knowledge acquired by means of the senses, particularly by observation and experimentation. The term comes from the Greek word for experience, ἐμπειρία (empeiría). After Immanuel Kant, it is common in philosophy to call the knowledge thus gained a posteriori knowledge. This is contrasted with a priori knowledge.