differential

• 1. 微分: differential | differential calculus | differentiation | Derivative
• 2. 常微分方程: ODE | differential equation
• 3. 偏微分方程: partial differential equation | PDE

更多释义

• 1.我们称这种变数为密度微分。
  We call this variation the density differential.
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• 2.利用微分法我们会尝试在这种特殊情况下以 dz 表示 df。
  Using differentials means that we will try to express df in terms of dz in this particular situation.
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• 3.这种毡制品只是为了消除与塑料产生太多的摩擦力，或者让它与外壳稍微分开。
  This felt thing there is just to avoid too much friction from building up with the plastic or to keep it slightly separated from the case.
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