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A pre-roll is a short advertisement that plays before the video you actually opened. On YouTube and many other sites, the pre-roll comes first, and only then does the real video start. Some you can skip after a few seconds; some you cannot. People who buy ads like pre-rolls because almost everyone who clicks the video will see them, at least for a moment. The word belongs to internet video, not to old newspapers. Though actually, the same spelling can mean a cigarette already rolled before you buy it — but this entry is only the ad that comes first.
前貼廣告、片頭廣告（影片開始前先播的那則；口語也常直接說 preroll）
組成pre- (before) + roll (the video starts to roll, like film). The ad comes before the film rolls.
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
這個拼法也被記錄為下列字的變化形：
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。