Someone who does not tell you — they put the thing where you can see it. A pair of hands working the machine in front of a small crowd; a group carrying an opinion out of the house and into the square; a car left unlocked on the forecourt so you can sit in it. The word does not say who is right or what is being shown. It only says: this is here to be seen, and this is the one doing the showing.
Three branches
做給你看的人
這一支是核心畫面最直接的樣子：靠動手示範讓人明白，而不是靠說明。
noun · B2
A person who shows other people how to do something or how something works — often someone paid to show a product in a shop or at a fair, and also anyone who proves a point by showing it rather than just saying it.
示範的人、展示人員
把意見擺到街上的人
展示的東西換成了「想法」：本來留在心裡的意見，被搬到大家看得到的地方。
noun · B2
A person who takes part in a demonstration — a public march or gathering where a group shows what they think about something, usually to ask the people in charge to change it.
示威者、遊行的人
拿來示範的那一台
-or 這個尾巴人和物都能指，所以「負責被示範的那一件東西」也用同一個字。
noun · C1
A thing — very often a car — that a shop or company keeps so customers can see it working or try it before they decide to buy one.
展示品、試用／試乘的那一台