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In the Oxford Dictionary of English 3rd, it says:

It girl

noun informal
A young woman who has achieved celebrity because of her socialite lifestyle.

Origin
Coined by the American screenwriter Elinor Glyn (1864–1943) with reference to the American actress and sex symbol Clara Bow, who made her name in such films as 'It' (1927). The current use dates from the 1960s.

https://en.oxforddictionaries.com/definition/it_girl

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'It' is only one film, so why does it use 'such films' instead of 'such a film'?

Would you be so kind as to help me?
Thanks!

PS I also posted the same question on this , but all of your answers are unique to me. Hope we can discuss with each other. Thank you.

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who made her name in such films as 'It' (1927).


This means in films such as 'It'. There are many films of the type being discussed. 'It' is just an example.