integral
/ˈɪntɪgrəl; `ɪntəɡrəl/ adj
1 ~ (to sth) necessary for completeness 构成整体所必需的
The arms and legs are integral parts of the human body; they are integral to the human body. 手臂和腿是人体的组成部分, 是构成完整的人体必不可少的.
2 [usu attrib 通常作定语]
having or containing all parts that are necessary for completeness; whole 具备构成整体所必需的所有部分的; 完整的
an integral design 完整的设计.
3 [usu attrib 通常作定语]
included as part of the whole, rather than supplied from outside 作为整体的一部分的（并非来自外部的）
a machine with an integral power source 有内置电源的机器.
4 (mathematics 数) of or being an integer; made up of integers 整数的; 由整数组成的; 积分的.