怎么翻译（中译英）：本文首先介绍分数阶微分的背景和研究现状,然后就Jumarie多元函数混合分数阶偏导数的计算,给出次序

This text began with the introduction of the background and research current condition of fractional differential gave an adequate condition of the exchangeable order for the calculation of the partial derivative of mingled fractional order of Jumarie's functions of several variables and gave definite examples to practise an exemplification for the fractional derivative; fractional order mixed derivative ; Jumarie's fractional order
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