demonstrator
demonstrator — noun
1. a person whose role is to show other people how a product works or how a task is
a person whose role is to show other people how a product works or how a task is performed by doing it in front of them — for example, a salesperson in a store who makes drinks to display a blender, or a teaching assistant who runs a lab session for students.
A kitchen-appliance demonstrator showed the shoppers how to chop vegetables in under ten seconds.
compound noun + shows + how-to clause; retail context
Kian, a cosmetics demonstrator, taught customers how to apply the new foundation.
The biology demonstrator helped the first-year students prepare their slides before the lab session began.
Brandon was hired as a demonstrator to show farmers how the irrigation system saved water.
- presenter
focuses on the act of presenting, often used for TV or stage; less common for in-store product demos
- instructor
emphasises teaching step-by-step; more formal and usually implies a longer teaching relationship
- exhibitor
someone who displays products at a trade show or exhibition; broader scope than a one-on-one demo
- spectator
watches the demonstration rather than performing it
用法筆記
At British universities, a demonstrator is often a postgraduate student who helps run practical sessions in science subjects. In retail, demonstrators are hired to present products in department stores or at trade shows.
常見錯誤
2. someone who joins an organised public event — such as a march or rally — to expr
someone who joins an organised public event — such as a march or rally — to express strong feelings about an issue, either in opposition or in support.
Thousands of demonstrators gathered outside the city hall to demand action on climate change.
plural + gathered + to-infinitive purpose; typical news-report pattern
Rachid joined the demonstrators who were calling for safer working conditions at the factory.
The demonstrators walked quietly through the streets holding signs that listed their demands.
Police officers spoke with the demonstrators to make sure the event stayed peaceful.
- protester
more specific — always implies objection or disagreement, whereas demonstrator can include supporters
- marcher
focuses on the form of action (walking in an organised line); less formal and less common in news headlines
- activist
implies ongoing, committed involvement in a cause, not just attendance at a single event
- bystander
someone who is present but does not take part; neutral rather than expressive
用法筆記
Common in news reports and formal contexts. Unlike protester, which always signals opposition, demonstrator covers both those who oppose and those who support a cause — for example, pro-government demonstrators.