... differential particle flux density粒子微分通量密度 differential pen差动笔 differential permeability微分导磁率；差异渗透率 ...
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Instead, to demonstrate the "red effect" I should have used an image of an elderly man solving a system of differential equations using a red pen.
相反，为了证明“红色效应”，我应该使用一张一个老男人用红笔求解微分方程系统的图像。
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