proving ground

Protest movements have often been a proving ground for future elected officials, according to Jonathan Hanson, a political scientist at the University of Michigan.

Bondy was also the proving ground where a prodigy was created.

As parents fell under the sway of reading lists for “gifted” kids, story time became yet another proving ground.

The tube is the heart of the new European Hyperloop Center that opens Tuesday and will be a proving ground in coming years for developers of the evolving technology.

The festival’s message explained its Army sponsorship, noting that the “defense industry has historically been a proving ground for many of the systems we rely on today.”