最后给出了高阶相对导数的定义，并通过实例加以说明。
Finally, the definition of higher relative derivative is given. Further, we give an interpretation by an example.
弹性又称为相对导数，它在商品经济活动中有着广泛的应用，诸如用价格调节需求等。
Elasticity, also called relative derivation, is extensively applied in the activity of commodity economy , such as adjusting the demand with price.
研究表明，通过借助于矢阵概念，在涉及多个坐标系时，张量的相对导数得到了更加清晰和严格地描述。
It was shown that with the help of vectrix one can treat the relative derivatives of a tensor more clearly and more rigorously when multiple reference frames were concerned.
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