demonstrator

• 名词，指演示或讲解某事物如何运作或操作的人，也指参加公众抗议或集会的人。

A noun referring to a person who shows or explains how something works or is done, or someone who takes part in a public protest or rally.

1. Teacher or assistant demonstrating principlesB2formal

   A person, often a teacher or teaching assistant, who shows and explains principles or techniques being taught.

   演示者

   • The chemistry demonstrator showed the students how to mix the compounds safely.
   • Our physics demonstrator explained the principles of electromagnetism with a live experiment.
   • The lab demonstrator guided us through the dissection process step by step.

   同义词expositorinstructorlecturerteachertutor

2. Sales demonstratorB2formal

   A person who shows how a product works to potential customers, often in a store or at a trade show.

   演示销售员

   • The demonstrator at the electronics store showed us how the new blender works.
   • A product demonstrator was explaining the features of the vacuum cleaner to shoppers.
   • The car demonstrator let me test drive the new model.

   同义词exhibitorpitchmanpromotersales repsalesmansalespersonsaleswoman

3. Participant in a public protestB2formal

   A person who takes part in a public display of group feeling, such as a protest or march.

   示威者

   • Thousands of demonstrators gathered in the city square to demand change.
   • The demonstrators marched peacefully through the streets.
   • Police monitored the crowd of demonstrators to ensure safety.

   同义词activistmarcherprotester