point at 与 point to 区别何在?

point at 与 point to 区别何在? point to与point at的区别 point to与 point at的区别? point at与point to的区别? point to sb与point at sb有什么区别? point to 和 point at的区别 point at与point out的区别 point at&point to point out point to point at的区别是什么? point at poing to区别 point to 和point at 有什么区别? point on point at point to 什么区别 能举例吗