add to alert的用法和样例：
- A “new mail” icon has been added to the edge of the minimap to alert players when new mail messages have arrived.
- I have nothing to add to my earlier statement.
- I didn't want to add to Mother's misery.
- Events to alert the user to invalid input.
- He honked his car horn to alert the pedestrians.
- The function of an adjective is to describe or add to the meaning of a noun.