proving ground

1. N-COUNT If you describe a place as a proving ground, you mean that new things or ideas are tried out or tested there. 試驗(yàn)場(chǎng)

New York is a proving ground today for the Democratic presidential candidates. 今天的紐約是民主黨總統(tǒng)候選人的試驗(yàn)場(chǎng)。