It can get an output from an input without knowing the mathematicrelation of input and output.
给定一个输入，即可得到一个输出，而不需要知道输入和输出之间存在着怎样的数学关系。
2
The mathematicrelation of indexes of energy consumption and the difficult index of saving energy were presented simultaneity.
同时给出了各能耗指标间的数学关系及节能难度指数。
3
On this basis, it emphasized how to establish the node basic information database and the restricting relation database, and constructed out the mathematic model of the planar linkage mechanism.