機器發出的嗶
這一組最貼近核心畫面：一個短短的電子音，從機器身上發出來，目的是叫你注意。
verb · A2
If a machine beeps, it makes a short high electronic sound to get your attention — for example when it has finished, when something is wrong, or when you press a button.
嗶嗶作響
核心畫面
One short, high, electronic sound, sent out to catch your attention. Press a button and a small clean note comes back. It carries no feeling of its own — it only says: look here.
beep 可以想成一個很短的高音「嗶」。這個聲音不是音樂，本身也不帶情緒。它存在的理由只有一個：要你抬頭看一眼。機器…更多收起
beep 可以想成一個很短的高音「嗶」。這個聲音不是音樂，本身也不帶情緒。它存在的理由只有一個：要你抬頭看一眼。機器用它說「好了」「不對」「我收到了」；車子把同一個聲音放大，變成路上的提醒。所以不管是微波爐還是喇叭，畫面都一樣——一聲短音打斷你正在做的事。From the word’s history
The source marks beep as onomatopoeic: the word is the sound, written down. That is why one word covers both the small machine tone and the loud horn — English never needed a second word, because both are the same noise at different volumes.
來源資料把 beep 標為擬聲詞：這個字就是照著聲音寫出來的。這說明了為什麼機器的小嗶和喇叭的大嗶共用一個字——對英文來說它們是同一種聲音，只是大小聲不同。
Wiktionary entry for beep (etymology 1), packet evidence kaikki:3f6f69a190036ae4:541042152 — "Onomatopoeic."
Two branches
喇叭放大的嗶
把核心畫面的音量調大、搬到馬路上，聲音的工作還是同一個：要對方注意。
verb · A2
If a car horn beeps, or if you beep your horn, it makes a short loud noise — usually to warn someone, to hurry someone, or to get their attention.
按喇叭