A local is a data object whose execution semantics shall return its value, whose scope shall be limited to the definition in which it is declared, and whose use in a definition shall not preclude reentrancy or recursion.

• 一个区域变数是一个执行语义是传回它的值的资料物件；它的範围必须被限制于它被宣告的定义中；并且它的在一个定义中的使用必须不能排除重入或递迴.