binomial
noun [ C ] specialized uk/baɪˈnəʊ.mi.əl/ us/baɪˈnoʊ.mi.əl/
mathematics 二项式
an expression (= a mathematical statement) that has two terms (= numbers or symbols) that are not the same
4x + y is a binomial. 4x + y 是一个二项式。
language （字词）成对搭配
two words separated by a conjunction that almost always appear in the same order, for example "bread and butter"