The phrase "at sustaining" is correct and usable in written English.
It can be used in contexts where you are discussing the ability or effort to maintain something over time.
Example: "The team's focus is at sustaining high levels of productivity throughout the project."
Alternatives: "in maintaining" or "for supporting".
But Atlantans work at sustaining the hospitality that once seemed congenital.
Germany is better at sustaining employment growth and productivity, while expanding citizens' real incomes.
Because the professionals have become so adept at sustaining the infants' lives, they now are focusing on their future development.
This introduces opportunities for public intervention aimed at sustaining technological development in SMEs, especially through technology transfer processes.
Over the past two months the government has announced a series of measures aimed at sustaining domestic demand.
Liberal civilizations, which depend on the assertion of the individual face, are better at sustaining meaningful lives than at commemorating the meaning of deaths.
And meanwhile, Mr. Brown was trying to persuade relatives fearful of flying to attend his daughter's bat mitzvah, an effort at sustaining at least the semblance of normalcy.
The Fed's seven interest rate cuts this year have been aimed in large part at encouraging consumers to spend and at sustaining home prices and home construction.
We are not bad at initiating breastfeeding, but not so good at sustaining it, and there is a significant drop-off by six months," she said.
Research has revealed that successful leaders are skilled at "sustaining the vision" of their companies by modeling optimism about their goals and flexibility about how to reach them.
She said that Alexa is getting better at sustaining longer conversations, and can do things such as responding to whispered commands by whispering itself.
