The theory of knowledge is a long tradition in the history of philosophy, and the reflections on knowledge mainly come form within the pure reason.

知识论是哲学史上一个悠久的传统，而对知识的反思主要来自纯粹理性内部。

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The lecture, entitled Faith, Reason and the University: Memories and Reflections, explored the historical and philosophical differences between Islam and Christianity, and the relationship between violence and faith.

BBC: Pope Benedict XVI in his own words

The high-frequency sound from the transmitter produces sharp reflections of small objects for the same reason that an electron microscope (which operates at high frequencies) can see smaller things than a light microscope (which operates at low frequencies).

ECONOMIST: Archaeology