negative integer

例句：

1. 1. The negative integers are the numbers that have a negative sign before them.
   负整数是带有负号的数字。
2. 2.In mathematics, negative integers are used to represent numbers that are less than zero.
   在数学中，负整数用来表示小于零的数字。
3. 3. The sum of two negative integers is also a negative integer.
   两个负整数的和也是一个负整数。