The phrase "is efficient at" is correct and usable in written English.
You can use it when talking about someone or something that performs a task quickly and effectively. For example: "John is efficient at completing paperwork."
"She is efficient at rooting out problems when agencies or departments spent their money the wrong way," he added.
By the time he published his second novel, "A Gesture Life" (1999), a familiar Chang-Rae Lee narrator had begun to emerge: a finally solitary man, who has difficulty knowing himself, is efficient at repression, and has been abandoned by women who do not care to plow the rest of their lives into emotional archeology.
For example, Facebook is efficient at dispensing virtual empathy — the good feelings that people get when all their friends wish them happy birthday through the service — as well as teaching people how to be more compassionate and share those feelings offline.
If Phoenix cars are in high demand and it is efficient at manufacturing, Altair will prosper.
This indicates that the outline methodology is efficient at converting all selenate into selenite.
It is important to note that only one of the DMUs is efficient at the same time.
The KGB was efficient at breaking up the supply chain.
"The Fords are efficient at getting out the vote in Memphis," Mr. Chesteen said.
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".
Bacteria are well-known decomposers of dead animal flesh and are efficient at converting animal tissues to simpler organic compounds.
