Another limitation of SOP is that it USES the toString function to serialize the variables and therefore cannot be used for complex variables by default.
SOP的另一限制是使用toString函数将变量序列化，因此缺省情况下它不能用于复合变量。
Examples are given for solving complex problem by transferring variables in recursive function program, and the recursive function programs show excellent capability for solving non-numeral problem.
给出了递归函数调用时利用变量传递解决复杂问题的实例，展示了递归算法在解决非数值运算问题中的独特解题方式和效果。
Limit of function of two variables is more complex than that of one variable.
二元函数的极限远比一元函数的极限复杂，但它们之间又有密切的联系。
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