音樂裡的顫音
這一族最貼近核心畫面：來回的兩端是寫在譜上的兩個音，抖動是刻意做出來的技巧。
noun · C1
In music, a decoration where a player or singer moves quickly back and forth between one note and the note just above it, so the two notes sound like a fast shake.
顫音（音樂裝飾音）
核心畫面
You can think of trill as one picture: something moving back and forth so fast that you stop hearing separate beats and hear a shake instead. In music that movement is between two notes next to each other. Outside music it can be a bird's throat, a tongue against the roof of the mouth, or a small electronic beep repeating. The speed is the point — slow the same movement down and it is just two sounds taking turns.
「trill」可以想成同一個畫面：某個東西來回得太快，快到你聽不出一下一下，只聽見一陣抖動。在音樂裡，來回發生在相鄰…更多收起
「trill」可以想成同一個畫面：某個東西來回得太快，快到你聽不出一下一下，只聽見一陣抖動。在音樂裡，來回發生在相鄰的兩個音之間。離開音樂，來回可以發生在鳥的喉嚨、舌頭與上顎之間，或是一個不斷重複的電子提示音。重點一直是速度。把同樣的來回放慢，它就只是兩個聲音輪流出現，不再是 trill 了。From the word’s history
The supplied Wiktionary entry traces trill through Middle English trillen to Italian trillo / trillare, the name of the musical ornament. That fits the shared picture: the word starts as the two-note shake and is then lent to any sound with the same fast back-and-forth quality.
來源資料指出，trill 經由中古英語 trillen，來自義大利文的 trillo／trillare，也就是音樂上的顫音。這和整個字的共同畫面對得上：它先是「兩個音之間的快速來回」，之後才被借去形容任何有同樣抖動感的聲音。
Wiktionary (kaikki extract supplied in this packet; source_ref kaikki:3f6f69a190036ae4:496840719:17714): “From Middle English trillen, from Italian trillo, trillare.”
Four branches
鳥叫、貓聲、電子提示音
同樣的快速抖動，只是沒有樂譜也沒有技巧：聲音自己高高地連續重複，人只是聽見。
noun · B2
A short high sound that repeats very fast, such as the call of a bird, the noise a cat makes in its throat, or a small electronic beep.
一串短促的高音
人說話時的甜嗓
把鳥叫的畫面借到人身上：嗓子拉得又高又亮，像在唱歌，於是聽起來也可能像在演。
verb · C1
To say something in a high, cheerful voice that sounds a little put on, so the listener may feel the happiness is not quite real.
用假甜的高嗓音說
語音學的顫音
來回的兩端換成口腔裡的兩個部位：舌頭（或嘴唇）快速拍打，抖動從音高移到了發音動作上。
noun · C1
In the study of speech sounds, a consonant made by letting the tongue or the lips flap very fast against another part of the mouth, such as the rolled ‘rr’ in Spanish.
顫音（語音學）