送出訊號的機器
最具體的那一支：核心畫面裡的「送出去的那一端」剛好就是一台看得見、摸得到的設備。
noun · B2
A piece of equipment that sends out radio or television signals, so that sets far away can pick them up.
發射器／發射台
核心畫面
One way to picture transmitter: the sending end. Something starts here, leaves, and arrives somewhere else, and this is the thing that pushed it out. At the far end sits the receiver, the catching end. Whether what travels is a radio signal, a virus, or a way of speaking that a grandmother hands to a child, the picture does not change: this end lets it go, and another end takes it in.
「transmitter」可以想成「送出去的那一端」。有東西從這裡出發，離開，到達另一個地方，而它就是把東西推出去的…更多收起
「transmitter」可以想成「送出去的那一端」。有東西從這裡出發，離開，到達另一個地方，而它就是把東西推出去的那個角色。另一端負責接的，英文叫 receiver。至於路上跑的是無線電訊號、是病毒，還是奶奶傳給孫子的說話方式，畫面都一樣：這一端讓它離開，另一端把它收下。From the word’s history
The packet records transmitter as transmit plus the suffix -er. That -er covers both a person who does something and a thing that does it, which is why one word holds both a machine and a person who passes something on.
詞源資料把這個字記成 transmit 加上字尾 -er。而 -er 既能指「做這件事的人」，也能指「做這件事的東西」。這正好說明為什麼同一個字可以一邊是山上的發射台，一邊是把疾病或文化傳給別人的人。
Wiktionary etymology field supplied in the evidence packet: From transmit + -er (with -er traced through Old English -ere).
Two branches
把東西傳給別人的人或事物
同樣是「送出去的那一端」，只是把機器拿掉，只留下那個動作。路上跑的東西換成疾病、訊息或一種生活方式。
noun · C1
A person, animal, or thing that passes something on to another person or thing — for example a disease, a message, or a way of living. This is a formal word.
傳播者／傳遞者
原始詞典資料2 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。
transmitternoun
- 1
One who or that which transmits something (in all senses).
- Epinephrine and dopamine are two other catecholamine transmitters.
- Habituation and dishabituation allow for experience-dependent tuning of these reflexes and the mechanisms underlying these forms of behavioral plasticity involve changes in transmitter release from the sensory to motor neuron synapses through homosynaptic depression and the serotonin-mediated recovery from depression, respectively.
- 2
An electronic device that generates and amplifies a carrier wave, modulates it with a meaningful signal derived from speech, music, TV or other sources, and broadcasts the resulting signal from an antenna.
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。