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A loudhailer is a small machine you hold in your hand. You speak into it, and it throws your voice much farther, so a crowd can hear you. Police, tour guides, sports teachers, and people at protests use it. This is mainly British English. In American English the same tool is almost always called a megaphone, and many meet that word first. Though actually, even in Britain people now say megaphone quite a lot; loudhailer can sound a bit older, or a bit more like official or police talk. It is a real object, not a person with a loud voice.
大聲公、手提擴音器（英式說法；美國多說 megaphone。台灣口語「大聲公」就是這物）
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。
loudhailernoun
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A megaphone or bullhorn.
- It's a grotesque, misleading smear on a diverse group of individuals – a bit like claiming all Muslims are terrorists (which, coincidentally, the guy beside them is currently doing through a loudhailer).
- As Ukrainian forces struggled to hold the flattened city, it was claimed that civilians in captured territory were being deceived into leaving shelters to be bussed out to Russian camps by soldiers wielding loudhailers. […] Russian soldiers with loudhailers were instead said to be driving around parts of the city claiming that the city of Odesa has fallen and that other havens for refugees were now rejecting fleeing people.
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。