demonstrator
/ˈdemənstreɪtə(r)/noun
1
- a person who takes part in a public protest meeting or march集会示威者, 游行示威者。
2
- a person who shows how a particular piece of equipment works or how a skill or craft is performed演示者。
2.1
- a person who teaches in this way, especially in a laboratory演示教师, 演示教学者。
2.2
- a piece of merchandise which can be tested by potential buyers样品; 可试用样品。