以下是优化后的内容：美股三大指数小幅下跌。道指跌0.03%，报41953.32点；标普500指数跌0.22%，报5662.89点；纳指跌0.33%，报17691.63点。科技股普跌，苹果跌0.53%，微软跌0.25%，亚马逊跌0.3%，博通...