Cách sử dụng
The word "unannounced" means that something happens without any warning or notice being given beforehand. It can be used to describe unexpected visits or events, such as a surprise visit from a friend or a pop quiz in school. It can also be used to describe actions that are not previously known or communicated, such as an unannounced change of plans. In general, "unannounced" refers to situations where there is no advance notice or communication about what is going to happen.