各种形式的门都在关闭

各种形式的门都在关闭，物理的、虚拟的，人员来往的、资金流通的，人际交往的、心灵互通的，……

All kinds of doors are closing: physical and virtual ones; doors for the movement of people and the flow of capital; doors between human relationships and between hearts and minds…

——尼古拉斯•赵四