还存在其他执行(exec)某个进程的系统调用，它们的区别在于接受参数的方式和是否需要传递环境变量。
There are other system calls to exec a process, and they differ by how they accept parameters and if environment variables need to be passed.
这种结构利用了Python可以将方法视为变量并可以将它们作为参数传递(传递的方式与传递字符串或整数相同)的优势。
This structure takes advantage of Python's ability to treat methods as variables and pass them as arguments in exactly the same way a string or integer would be passed.
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。
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.
指定按如下方式传递参数：被调用的过程或属性不能更改调用它的代码中参数下面的变量的值。
Specifies that an argument is passed in such a way that the called procedure or property cannot change the value of a variable underlying the argument in the calling code.
指定按如下方式传递参数：被调用的过程或属性不能更改调用它的代码中参数下面的变量的值。
Specifies that an argument is passed in such a way that the called procedure or property cannot change the value of a variable underlying the argument in the calling code.
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