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differentiation
级别	附加级
音标	[ ˌdifərenʃi'eiʃən ]
解释	n.区别，区分
英英释义
发音
例句	1. There can be no differentiation without contrast. 有比较才有差别。 2. The operation that is the inverse of differentiation is called integration. 与微分相反的运算叫做积分。