美股道指及纳指上周五(21日)跌1.7%及2.2%,美股期货反弹,但亚太区股市仍普遍偏软。沪深股市回吐,沪指半日跌3点报3,375点,深成指报10,989点跌1点,港股恒指半日跌129点或0.5%,报...