an opportunity to see something such as a film or a collection of works of art before it is shown to the public, or a description of something such as a television programme before it is shown to the public预观；预展；预映；（电视节目等的）预告

short parts of a television show or film that are shown to the public in order to advertise it（电视节目或电影的）预告

to describe something or be shown before it officially begins预先播映（或展示），预告