某些东西的名字和写法

#include<iostream>
using namespace std;
class Point
{ public:
Point()
{ X=Y=0; cout<<"Default Constructor called."<<endl; }
Point(int xx,int yy)
{ X=xx; Y=yy; cout<< "Constructor called."<<endl; }
~Point()
{ cout<<"Destructor called."<<endl; }
int GetX() {return X;}
int GetY() {return Y;}
void Move(int x,int y)
{ X=x; Y=y; }
private:
int X,Y;
};
class ArrayOfPoints
{
public:
ArrayOfPoints(int n)
{ numberOfPoints=n; points=new Point[n]; }
~ArrayOfPoints()
{ cout<<"Deleting..."<<endl;
numberOfPoints=0; delete[] points;
}
Point& Element(int n)
{ return points[n]; }
private:
Point *points;
int numberOfPoints;
};

int main()
{
int number;
cout<<"Please enter the number of points:";
cin>>number;
ArrayOfPoints points(number);
points.Element(0).Move(5,10);
points.Element(1).Move(15,20);

}
红色这一句&是什么意思？
Element
是什么东西？
蓝色这一句好几个.（点）
这又怎么个讲法？我不明白这是怎么个表示法？