The phrase "a string of centers" is correct and usable in written English.
It can be used to describe a series or sequence of central points or locations, often in a metaphorical or abstract sense.
Example: "The city is known for a string of centers that cater to various cultural and recreational activities."
Alternatives: "a series of hubs" or "a chain of focal points."
Mr. Assad, according to people who have spoken with him, believes that reasserting his hold in Homs Province is crucial to maintaining control of a string of population centers in western Syria, and eventually to military campaigns to retake rebel-held territory in the north and east.
Most recently GoFundMe ran a string of campaigns centered around aid for victims of the Nepal earthquake.
Mr. Posada has publicly acknowledged organizing a string of terror bombings centered on Havana hotels that began in 1997, and suggested that he did so with money provided by Cuban exiles in the United States, without identifying them.
That leaves hospitals like Lutheran, which is nonprofit and has run a string of such primary care centers for 40 years, facing cuts at both ends.
And in a tip to his 21st century thinking, Gingrich also suggested a string of high-tech call centers manned by slaves working from modern igloos on the Alaskan tundra, bringing jobs back to America from India and Pakistan.
As part of the turnaround, the fund is moving away from such speculative investments as a 53-story Sacramento condo development that ran aground in 2007, in favor of a string of already-leased shopping centers and other safer bets.
For those not familiar with the term, it comes — like so many terms useful for contemporary economic discussion — from South Park, where the Johnny Cochrane character defends O.J. Simpson with a string of bizarre non sequiturs centering on everyone's favorite Wookie.
When anti-government demonstrations broke out on the streets of Tehran last week, powerful Iranian government officials pointed the finger of blame in an unlikely direction: a string of low-budget studios centered in the San Fernando Valley.
So I envision a string of adult camps or retreat centers (my oldest friendships were formed at summer camp, so I think in those terms).
The Pakistani government and relief agencies have set up a string of camps and food distribution centers in the area, but not nearly enough to accommodate all the people who need them.
