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"are efficient at" is correct and usable in written English.
You can use it when speaking about someone's skill or ability to do something. Example: My co-workers are very efficient at completing tasks.
Exact(50)
These microparticles are efficient at delivering DNA into cells, but cannot efficiently transfect small cells and may cause significant tissue damage, thus limiting their potential usefulness.
"The Fords are efficient at getting out the vote in Memphis," Mr. Chesteen said.
Bacteria are well-known decomposers of dead animal flesh and are efficient at converting animal tissues to simpler organic compounds.
Insensitive Americans are efficient at forgetting all about old defeats — who now remembers the 1984 Olympic team or, for that matter, the War of 1812?
Because of their chemical makeup, they are efficient at binding and storing mercury.
Rogers (1995) posits that such teams are efficient at passing information among group members.
Similar(10)
The KGB was efficient at breaking up the supply chain.
"She is efficient at rooting out problems when agencies or departments spent their money the wrong way," he added.
But with their three doors and high passenger capacities they were efficient at moving people around speedily.
"He certainly had the intelligence and he looked like he could be efficient at doing almost anything".
Often, he added, the county can protect and be efficient at the same time: "We have one penitentiary, when otherwise there would be 43 different jails".
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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