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示威者;示威游行（或集會）者
Demonstrators are people who are marching or gathering somewhere to show their opposition to something or their support for something.
例句
I saw the police using tear gas to try and break up a crowd of demonstrators.
我看見警察正試圖用催淚彈驅散一群示威者。
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示范者;演示者
A demonstrator is a person who shows people how something works or how to do something.
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樣品;試用品
A demonstrator is an item for sale that customers can use and test so they can decide whether they want to buy it.
例句
Saab dealers are currently giving away unaccompanied 24-hour test drives in posh demonstrator models.
薩博汽車的經銷商目前正推出高檔樣品車無人陪同的 24 小時試駕活動。