1.Addition, subtraction, multiplication, and division are binary operations.
1.加、减、
、
算。
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之美 1.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
非常正式和抽象的定义开始，即群是一集合（任何事物的集合）， 具有二元运算（些事物之间的乘法概念）， 
种乘法满足四特殊规则或公理。机翻
