单单选择同一元类的多项，例如一些属性。
Just select multiple items of the same metaclass, such as several attributes.
对于多项式，它由系数，未知元以及指数组成，考虑到它包括的属性较多，故链表是一种非常不错的选择。
For the polynomial, which consists of coefficients, the unknown element and the index composition, given that it includes more properties, so the list is a very good choice.
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