人講不停的輕鬆話
把那串又快又輕的短音放到人身上，就成了閒聊：話一句接一句，題目都很小，聽的人先感覺到的是「一直在講」這件事，而不是講了什麼。
verb · B2
To talk quickly and happily for a long time, usually about small everyday things that are not serious or important.
閒聊；講個不停
核心畫面
Chatter can be thought of as a run of small, light sounds that keep coming — quick, close together, and none of them heavy. A bird in a tree makes that run. So do teeth in the cold, a shaking machine, and a person telling you about their day. The picture does not say the sounds are worthless; it says each one is small and there are a great many of them, so what you notice first is the run itself rather than any single sound in it.
chatter 可以想成一串又快又輕的短音，一個接一個地冒出來，沒有哪一聲是重的。樹上的小鳥是這樣叫的。冷到不行的牙…更多收起
chatter 可以想成一串又快又輕的短音，一個接一個地冒出來，沒有哪一聲是重的。樹上的小鳥是這樣叫的。冷到不行的牙齒是這樣抖的。在震動的機器是這樣響的。一個興高采烈講著今天發生什麼事的人，聲音也是這樣一串一串出來。這個畫面不是說那些聲音沒有價值，而是說每一聲都很小、數量很多，所以你先注意到的是「那一整串」，而不是裡面的哪一聲。From the word’s history
Wiktionary records chatter from Middle English chateren, earlier cheteren ('to twitter, chatter, jabber'), described as of imitative origin — the word was made from the sound itself. That fits the picture: the mouth makes a run of quick light sounds just saying it.
Wiktionary 記錄 chatter 來自中古英語 chateren、更早的 cheteren（意思是啾叫、喋喋不休），並註明它屬於擬聲來源，也就是照著聲音造出來的字。這條線索正好對上上面的畫面：你光是把 chat-ter 念出來，嘴巴就已經做了一串又快又輕的短音。
Wiktionary entry for 'chatter', etymology 1 (kaikki extract source_ref kaikki:3f6f69a190036ae4:878397190:38030), supplied in this evidence packet
Three branches
鳥獸細碎的短促叫聲
這是最貼近那個聲音畫面的一支：小鳥、猴子發出的短音又高又快，一串接一串，聽起來熱鬧卻沒有旋律。
verb · B2
If birds or monkeys chatter, they make a lot of short, high sounds one after another.
啾啾叫；吱吱叫
硬物快速互敲的喀喀聲
同樣一串又快又輕的短音，這次不是從喉嚨來的，而是兩個硬東西一直互相碰到：牙齒、機器零件。
verb · B2
If your teeth chatter, they knock together quickly again and again because you are very cold or very frightened.
牙齒打顫