先理解核心含义，再看它在真实句子里的用法。
二项式
a quantity expressed as a sum or difference of two terms; a polynomial with two terms
The teacher explained the concept of a binomial to the class.
老师向全班解释了二项式的概念。
In algebra, binomials are polynomials with exactly two terms.
在代数中，二项式是只有两项的多项式。
A binomial can be expanded using the FOIL method.
二项式可以用FOIL方法展开。
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Dictionary facts from ECDICT.