美国天然气期货跌超4%，现报3.209美元/百万英热

Group 1 - The core point of the article is that U.S. natural gas futures have experienced a decline of over 4%, currently priced at $3.209 per million British thermal units [1] Group 2 - The decline in natural gas futures indicates potential volatility in the energy market, which could impact related sectors and companies [1]