exposition [ˌekspəˈzɪʃn]

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n.说明，讲解，展览（会），陈列

a clear and full explanation of an idea or theory

John gave a very exposition of the facts. 约翰把事实解释得很清楚。
His pictures were shown at the Paris exposition of 1878. 他的画在1878年巴黎博览会上展览过。