美股三大股指走低，盘中跌幅均跌超0.3%。

Core Viewpoint - The three major U.S. stock indices declined, with intraday losses exceeding 0.3% [1] Group 1 - The decline in stock indices indicates a bearish sentiment in the market [1] - The overall market performance reflects potential concerns among investors regarding economic conditions [1] - The drop in indices may influence investor strategies and market outlook moving forward [1]