trinomial

A trinomial expression has exactly three terms, such as a + b + c.

用法提示：trinomial 作形容词，表示“由三个项组成的”，修饰 expression。

The biologist gave the subspecies a trinomial name that lists genus, species, and subspecies.

用法提示：trinomial 作形容词，说明 name 由三个名称部分构成。

We organized the project files with a trinomial system based on three main categories.

用法提示：trinomial 作形容词，表示“分成三部分的”，描述 system。