把東西或消息帶過去的人或物
這一支就是字面上的角色本身：convey 的人或物。
noun · B2
A person or a thing that carries something from one place to another, or that passes news, ideas or feelings on to other people.
傳送者；傳達者
核心畫面
Think of a gap between here and there, and something that takes the thing across it so the thing does not have to get there by itself. A person can play that part, and so can a pipe, a radio, a word — or a moving belt. Conveyor names the part, not the thing being carried.
可以想成這裡和那裡之間有一段距離，而有某個東西負責把貨物或消息帶過去，讓它自己不必移動。扮演這個角色的可以是人，也可…更多收起
可以想成這裡和那裡之間有一段距離，而有某個東西負責把貨物或消息帶過去，讓它自己不必移動。扮演這個角色的可以是人，也可以是水管、收音機、一個字，或是一條會動的帶子。conveyor 指的一直是「負責帶過去的那一個」，不是被帶的東西。From the word’s history
Wiktionary gives the make-up of the word as convey + -or: convey is to carry or pass something over to someone, and -or names the one who does it. The modern uses are all that one role, given to different things.
Wiktionary 記的組成是 convey + -or。convey 是「把東西或意思送過去」，-or 是「做這件事的那一個」。今天的各種用法，都只是把這個角色交給不同的東西去扮演。
Wiktionary entry for conveyor, etymology field: "From convey + -or." (kaikki:3f6f69a190036ae4:1188689963:12019)
Two branches
替人做這件事的那台機器
同一個角色縮小到一種特定的東西：一條會動的帶子。機器接手了原本人做的事，名字就跟著留在機器上。
noun · B1
A conveyor belt: a long moving band, or a line of turning rollers, that carries things along from one place to another in a factory, an airport, a shop or a restaurant.
輸送帶