把聲音送到耳朵的那一塊
這兩個都在耳朵那個位置工作，工作內容也一樣：讓聲音只進到一個人的耳朵裡。
noun · B2
A small piece of equipment that you put into your ear, or hold against it, so that you can hear sound coming from a phone, a radio or a recording.
耳機（塞在耳朵裡的小型聽筒）
核心畫面
The word is built the plain way, ear plus piece, so one way to hold it is: the part of a thing that ends up at your ear. Put your finger on the top of your ear and whatever sits there gets this name — the little speaker pushed into the opening, the rounded end of a telephone pressed against it, the thin arm of your glasses hooked over it. The name comes from the place, not from the job, which is why two of these carry sound and one carries nothing at all.
這個字組得很直白，ear 加 piece，所以可以想成：一樣東西上「落在你耳朵那一塊」。把手指放在耳朵上，停在那裡的…更多收起
這個字組得很直白，ear 加 piece，所以可以想成：一樣東西上「落在你耳朵那一塊」。把手指放在耳朵上，停在那裡的東西就叫這個名字。塞進耳孔的小喇叭是，電話貼著耳朵的圓頭是，眼鏡掛在耳朵上的那一支也是。取名靠的是位置，不是功能。所以這三個裡面，兩個在傳聲音，一個完全不傳，只負責掛住。From the word’s history
The source gives the make-up directly: from ear + piece. The word says where the part sits, and every use follows from that one location.
來源直接寫出組成：ear 加上 piece。這個字說的是「位置」，三個用法都是從同一個位置長出來的，只是各自做著不同的事。
Wiktionary (kaikki extract, source_ref kaikki:3f6f69a190036ae4:1451871389:9178): "From ear + piece."
Two branches
掛在耳朵上的那一塊
位置一樣，工作完全不同。這一支不傳聲音，它只是掛住。這正好看出這個字是按「在哪裡」命名，不是按「做什麼」。
noun · B2
One of the two long side parts of a pair of glasses. Each one reaches back from the frame and hooks over the top of your ear to hold the glasses in place. Usually used in the plural.
眼鏡的鏡腳