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The phrase "are first introduced" is correct and usable in written English.
It can be used when discussing the initial presentation or explanation of a concept, idea, or character in a narrative or academic context.
Example: "In the first chapter, the main characters are first introduced, setting the stage for the unfolding story."
Alternatives: "are initially presented" or "are first revealed".
Exact(60)
The key elements of the system are first introduced.
The most important rules and parameters are first introduced.
The technologies of the concept are first introduced and discussed.
The coupled non-linear modes are first introduced.
The compression-molded polyimide engineering plastics and injection/extrusion processed engineering plastics are first introduced.
Key concepts are first introduced in terms of general requirements of structural crashworthiness and occupant safety.
The principles are first introduced in three categories including biological, chemical and physical stimulation.
Aptamers specific for a wide range of targets are first introduced and compared to antibodies.
In this paper, major technique barriers and proposed system architecture are first introduced.
In this study, the principle and characteristics of MPP/HPPMS technique are first introduced.
More specifically, the Mars entry process and main technical challenges are first introduced.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com