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"proving grounds" is correct and usable in written English.
It is used to refer to a place where people can test or demonstrate their capabilities or the quality of something. For example, "The team arrived at the proving grounds to give their skills a thorough test."
Dictionary
proving grounds
noun
Plural of proving ground
Exact(60)
Large automotive (tire) proving grounds are nearby.
(American companies tend to use their own test tracks and proving grounds, but not always).
"We are the crossroads of the American Revolution and the proving grounds of the high-tech revolution".
But as she returns to the proving grounds of a Grand Slam event, Safina must still manage a tangled legacy.
— A Ford Transit van slams its way over concrete obstacles in a test of durability here at the automaker's proving grounds some 40 miles north of Detroit.
It is building the country's largest proving grounds and broke ground this week on a $250 million advanced technology center to research batteries and other alternative energy sources.
After 30 minutes in Long Island traffic on the Sunrise Highway — Motion's makeshift and highly illegal proving grounds — the engine began to regurgitate coolant.
Mr. Champion, who worked at the consumer magazine's testing headquarters in East Haddam, Conn., will be based at Nissan's proving grounds in Stanfield, Ariz.
It is constructing the country's largest proving grounds and broke ground this week on a $250 million advanced technology center to research batteries and other alternative energy sources.
Aware that crises can be proving grounds for leaders, the candidates are brushing up, meeting with environmental consultants and financial experts.
During a drive in deep sand at Ford's proving grounds in Michigan, the Explorer struggled with the Terrain Management on the "normal" setting.
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CEO of Professional Science Editing for Scientists @ prosciediting.com