For example , to nest one loop ( the nested loop ) within another loop ( the nesting loop ) ; to nest one subroutine ( the nested subroutine ) within another subroutine ( the nesting subroutine ) 例如,在一個(gè)循環(huán)中嵌入另一個(gè)循環(huán),在一個(gè)子程序中嵌入另一個(gè)子程序。