verb · to provide initial instruction to children, especially teaching them how to read and write

他六岁就在家乡的私塾发蒙。

verb · to be confused or at a loss

事情发生得太突然，我一下子发蒙了。

extremely easy to accomplish; as easy as ABC

解决这个问题对他来说简直如发蒙振落般容易。