An advertisement is an announcement in a newspaper, on television, or on a poster about something such as a product, event, or job.
例句
Miss Parrish recently placed an advertisement in the local newspaper.帕里什小姐最近在本埠報紙上登了一則廣告。
N-COUNT
（某一類事物的）活廣告
If you say that an example of something is an advertisement for that thing in general, you mean that it shows how good that thing is.
例句
The England team were a poor advertisement for European football tonight...英格蘭隊今晚為歐洲足球做了一次糟糕的宣傳。That would not be a good advertisement for Hungary's emerging democracy.那并不能有效地體現匈牙利新興的民主意識。