demonstrator /ˈdɛmənˌstreɪtə/

• 1. 

  N-COUNT Demonstrators are people who are marching or gathering somewhere to show their opposition to something or their support for something. 游行者; 集会示威者

  例：

  I saw the police using tear gas to try and break up a crowd of demonstrators.

  我看到警察使用催泪瓦斯试图驱散示威人群。

• 2. 

  N-COUNT A demonstrator is a person who shows people how something works or how to do something. 展示者

  例：

  ...a demonstrator in a department store.

  …一名百货商场的产品展示员。