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"major metropolis" is correct and usable in written English.
You can use it when you are referring to an extremely large city. For example, "New York City is a major metropolis on the East Coast of the United States."
Exact(59)
This is the only major metropolis in South Africa where black people are not the majority, and it remains deeply divided.
It is the site of Manila, the nation's capital and major metropolis, and of Quezon City.
Where else can you watch world-class sport in a major metropolis for as little as a tenner a head?
(Many young professionals commute to jobs in West Palm Beach, the nearest major metropolis, about 40 miles south).
True, as with any major metropolis, you could pass a week in the city and still not probe all its corners.
The novel successfully captures the hectic nature of life in a major metropolis, but at times the density of detail overwhelms the narrative.
Until now, Ms. McMahon explained, New York City was the only major metropolis in the country without a wildlife rehabilitation center — but not for lack of need.
There he continued working on cityscapes: unusual images of streets devoid of people, traffic, and the unceasing movement typical of a major metropolis.
In the aftermath of a large protest on Sunday in a major metropolis in northeast China, Dalian, that craving for rigid orderliness appears increasingly ephemeral.
It was a battle to avoid the end of New York City as a viable major metropolis — an event that could have caused a global financial meltdown.
This city -- the nation's fastest-growing major metropolis, improbably enough -- was firmly plopped down in a place that was never meant to amount to much.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com