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The phrase "a world-class expert" is correct and usable in written English.
It can be used to describe someone who is highly skilled and recognized as one of the best in their field.
Example: "Dr. Smith is a world-class expert in renewable energy technologies, frequently consulted by governments and organizations worldwide."
Alternatives: "top-tier specialist" or "leading authority".
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All these landmarks were named for Dr. Frank J. Sacherer, a theoretical physicist at CERN, who was a world-class expert on the behavior of particle accelerators.
You may have learned, in recent months, that you can't actually become a world-class expert in anything you like, merely by putting in 10,000 hours of practice.
McEwan is, in other words, a world-class expert on human violence -- its rules, roots and reverberations -- and in his more recent work he has set his diagnostic skills to work on larger confrontations.
And sometimes the lead partner had an opportunity to involve a world-class expert from an office not only in the same country but within driving distance and didn't.
For instance, a computer science course at one university could incorporate an online module on cryptography or database design taught by a world-class expert in that specialty at another university.
Prof. Stephen Stigler is a world-class expert on the history of statistics.
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Neurologist Daniel Levitin says "the emerging picture from such studies is that 10,000 hours of practice is required to achieve the level of mastery associated with being a world-class expert-in anything.
Tom is a world class expert who has done remarkable stuff in his career.
A world class expert might work for 20+ years to figure something out, completely devoting her entire life to answering one particular question, which you get for the cost of lunch.
It completely flips the standard action-movie narrative, in which some world-class expert (the gunslinger; the safecracker; the ex-Green Beret) is lured out of hiding to tackle one last mission, to slay one last unslayable foe.
We know intimately a range of world-class experts who, like ourselves, can often be free for a few days or a week or two and could really help organisations if their expertise were to be properly orchestrated.
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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