demonstrator

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Thales Australia Selected for the Capability and Technology Demonstrator Program
日前，泰利斯澳大利亚公司被能力与技术演示（CTD）计划选中，为澳大利亚国防军（ADF）提供不断增加的作战能力。
www.etiri.com.cn
A demonstrator is arrested by riot policemen during a students' rally to demand changes in the public state education system in Santiago, on August 9, 2011. (Reuters/Carlos Vera Saavedra)
圣地亚哥，要求改革公立教育制度的学生集会上，一名示威者被警察拘捕。
Howe says he is in talks with what he refers to as "a large utility company" to sponsor the construction of a full-storage demonstrator system, something around the 100 kilowatt scale.
此外，豪透露说，他正与一家“大型公用事业公司”进行洽谈，劝说其赞助建造这种全存储机组的示范系统，规模约在100千瓦左右。

according to Al Baghdadia TV. One demonstrator complained that the Iraqi government was "not doing enough to protect its citizens."
Demonstrator Yitzhak Liebowitz accused the government of abandoning Zionism and caving in to dictates from the United States.

The Enterprise was built as a demonstrator Shuttle, designed for glide tests and not capable of spaceflight.
FORBES: Leonard Nimoy, Senator Charles Schumer Welcome Enterprise Shuttle to NYC

(PERSON SHOWING) a person who explains how something works or how to do something
(PROTESTER) a person who marches or stands with a group of people to show that they disagree with or support something or someone

Demonstrators are people who are marching or gathering somewhere to show their opposition to something or their support for something.
A demonstrator is a person who shows people how something works or how to do something.