The phrase "at a demonstrator" is not correct and does not convey a clear meaning in written English.
It may be intended to refer to a specific context, such as being present at a demonstration or event, but as it stands, it lacks clarity.
Example: "I was at a demonstrator showcasing the latest technology innovations."
Alternatives: "at a demonstration" or "at a display event".
There was the notorious epithet barked at a demonstrator during a public event, and the colloquial declaration that "Avec Carla c'est du sérieux" ("With Carla, it's for real") made during the press conference announcing his relationship with Carla Bruni, now his wife.
In one of the skirmishes, a man in a dark suit, who is carrying a furled flag, seemingly that of Turkey, appears to be kicking at a demonstrator who is on the Sheridan Circle sidewalk, holding his hands protectively to his head.
Academically, he served as a Demonstrator at the University of Western Australia, Courtesy Professor at Florida International University (Miami), Program Professor and Director of the Institute of Coastal and Marine Studies at Nova Southeastern University (Port Everglades, Florida), and Full Professor at FAU.
He remained at Cambridge, firstly as a Demonstrator in botany then as a researcher in the Plant Breeding Institute followed by the Department of Geography.
In 1948, Lindley accepted an offer of a post at Cambridge, initially as a demonstrator, working his way up to become director of the statistical laboratory.
Or look at buying a demonstrator which will have money knocked off it already.
At another point, a demonstrator shoved an officer to the ground, before another officer pulled him to safety.
Sequentially, he attracted the skills of Frederick Soddy, a demonstrator at McGill; Bertram Borden Boltwood, a professor at Yale University; and Otto Hahn, a postdoctoral researcher from Germany.
By Jia Tolentino February 23, 2017 A demonstrator at Monday's "Not My President's Day" rally, in New York.
A rally organizer told The Washington Post the attacker had aimed at the stage, but a demonstrator grabbed his hand and changed the grenade's direction.
The NECTAr project aims at building and testing a demonstrator module of a new front-end electronics design, which takes an advantage of the know-how acquired while building the cameras of the CAT, H.E.S.S.-I and H.E.S.S.-II experiments.
