基本含义
addition 是一个英语名词，主要表示“加法”或“增加（的事物）”。它源自动词 add（添加）。
常见用法与例句
1. 表示“加法”（数学运算）
- She is learning addition and subtraction in math class.
- This worksheet focuses on simple addition problems.
2. 表示“增加的人或物”
- The new baby is a wonderful addition to the family.
- This painting is a recent addition to the museum’s collection.
3. 常用短语：in addition (to)
意为“此外；除……之外（还）”，用于补充信息。
- In addition, we need to consider the environmental impact.
- In addition to his salary, he receives bonuses every quarter.
注意事项
addition 是不可数名词（当指“加法”或抽象“增加”时），但当指“新增的具体事物”时可数。例如：
- Correct: The house has two new additions.（指两个新增建筑部分）
- Correct: Basic arithmetic includes addition and subtraction.（不可数）