求助

分析一下这段程序的输出 (Autodesk)
    class B
    {
    public:
        B()
        {
            cout<<"default constructor"<<endl;
        }
        ~B()
        {
            cout<<"destructed"<<endl;
         }
        B(int i):data(i)    //B(int) works as a converter ( int -> instance of  B)
        {
            cout<<"constructed by parameter " << data <<endl;
        }
    private:
        int data;
    };
    B Play( B b)
    {
        return b ;
    }
    (1)                                         results:
    int main(int argc, char* argv[])            constructed by parameter 5
    {                                           destructed  B(5)形参析构
        B t1 = Play(5); B t2 = Play(t1);   　   destructed  t1形参析构
        return 0;　　　　　　　　　　　　       destructed  t2　注意顺序！
     }                                          destructed  t1
    (2)                                         results:
    int main(int argc, char* argv[])            constructed by parameter 5
    {                                           destructed  B(5)形参析构
        B t1 = Play(5); B t2 = Play(10);   　   constructed by parameter 10
        return 0;　　　　　　　　　　　　       destructed  B(10)形参析构
    }                                           destructed  t2　注意顺序！
                                                destructed  t1

上面程序究竟是怎么个走法？红色标记处是什么意思？请高手指教！