It is hard to draw in two dimensions a picture of a vector function in three-dimensional space.
在两维图上画三维空间的矢函数图形是件难事。
From this sense, utility vector function to measure the degree of suitability of each proposal is presented.
在这个意义上，定义效用向量函数来度量每一处理方案的适合程度。
Using circle vector function and medium rack as tools, the equation of contact trace is deduced, and its characteristic is discussed.
以圆矢量函数和媒介齿条为工具，推导了接触迹方程，讨论了接触迹的特性。
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