为什么要调用析构函数

这是我一直试图了解其工作方式的代码。

#include <iostream>

using namespace std;

class A
{
public:
    int variable;

    A()
    {
        cout << "Default Constructor\n";
    }

    A(int variable_)
    {
        cout << "Overloaded Constructor\n";
        variable = variable_;
    }

    A(A& Object)
    {
        cout << "Copy Constructor\n";
        variable = Object.variable;
    }

    ~A()
    {
        cout << "Destructor\n";
    }
};

void main()
{
    {
        A* PA1 = new A(1);

        cout << "\n";

        A* PA2 = &(A(*(PA1)));

        cout << "Second\n\n";

        A* PA3 = &(A(1));

        cout << "\n";

        A* PA4 = new A(*(PA3));
    }



    cout << "\n";
    system("pause");
}

为什么在初始化之后调用析构函数PA2？这是什么意思&(A(*(PA1))) and &(A(1))？

这是此代码的输出：