a teacher or teacher's assistant who demonstrates the principles that are being taught
someone who demonstrates an article to a prospective buyer
同义词：sales demonstrator
someone who participates in a public display of group feeling
同义词：protester
demonstrator例句
The police estimated the number of demonstrators at about2000.
警察估计示威游行的人数大约为2000人。
A surge of demonstrators broke through the fence.
汹涌而来的示威者冲破了围栏。
demonstrator详细解释
dem.on.stra.tor n.（名词）One that demonstrates, such as a participant in a public display of opinion.示威者：示威的人，例如一个表达意愿的公开集会的参加者An article or product used in a demonstration.示范品，样品：用于展示的物品或产品
