Addition, subtraction, multiplication, and division are binary operations.
加、
、乘、除都
二元运
。
声明：以上例句、词性分类均由互联网资源自动生成，部分未经过人工审核，其表达内容亦不代表本软件的观点；若发现问题，欢迎向我们指正。
A typical course starts with this very formal and abstract definition, which is that a group is a set – any collection of things – with a binary operation – a notion of multiplication between those things – such that this multiplication satisfies four special rules, or axioms.
典型的课程从这
非
和抽象的定义开始，即群是一集合（任何事物的集合）， 具有二
（这些事物之间的乘法概念）， 使得这种乘法满足四特殊规则或公理。
