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The Minoan civilization is often regarded as the first advanced civilization of Europe。()

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The Late Middle Ages are often described as a period of crisis and decline。()

为什么氢离子交换软化设备要防腐?为什么铵离子交换软化设备不要防腐?为什么混合式氢钠离子交换软化水中残留碱度最大?

The Islamic Golden Age is a period of cultural and intellectual growth and activity that persisted throughout the Islamic world between the 8th and 13th centuries。()

At the age of 30, Jesus started to preach; but he had no intention to create a new religion。()

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