虽然可以随心所欲地使内联外壳函数变得任意长，但在许多情况下，外壳函数并不理想。
Although you can make an inline shell function as long you like, there are many occasions when the shell function is less than ideal.
但是，提出理想模型却不是可以任意无限地抽象或随心所欲地假定。
Setting up an ideal model is by no means to abstract the object or make presumptions randomly or at will.
用户可以随心所欲地输入5 ~ 500之间的任意数，输入字段将接收输入并且将该值返回所属程序。
A user can enter anything he wants, from 5 to 500, and the field will accept it and return the value to the owning program.
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