letterbox發音名詞1投信口、信件投遞口英式She pushed the thick envelope through the letterbox and walked away.她把那個厚厚的信封塞進門上的投信口後就走了。2信箱、郵筒英式There were three bills waiting in the letterbox this morning.今天早上信箱裡有三張帳單。3寬螢幕模式、上下加黑邊的畫面影視The old film is shown in letterbox to keep the original framing.這部老片以上下加黑邊的方式播出，以保留原本的構圖。動詞1投遞傳單、發送宣傳品英式Volunteers letterboxed the whole neighborhood before the election.選舉前志工在整個社區挨家挨戶投遞傳單。形容詞1寬扁形的、橫長形的多用於名詞前The new phone has a letterbox screen for watching movies.這支新手機採用寬扁形的螢幕，很適合看電影。