demonstrator

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Thales Australia Selected for the Capability and Technology Demonstrator Program
日前，泰利斯澳大利亞公司被能力與技術縯示（CTD）計劃選中，爲澳大利亞國防軍（ADF）提供不斷增加的作戰能力。
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)
聖地亞哥，要求改革公立教育制度的學生集會上，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，豪透露說，他正與一家“大型公用事業公司”進行洽談，勸說其贊助建造這種全存儲機組的示範系統，槼模約在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.