U.S. President Barack Obama is calling on Congress to extend tax cuts for another year for the 98 percent of Americans who make less than $250,000 a year. The president in his weekly address today said a tax increase, scheduled to go into effect on January 1, would be a huge financial hit for middle-class families美国总统贝拉克奥巴马呼吁国会延长减税政策1年,因有98%的美国民众年收入不足250000美元,他在今天的每周电台演讲中称,一项计划于1月1日生效的增税政策将对中产阶级家庭产生巨大的经济打击。 ____________________________.VOA\'s senior White House correspondent Dan Robinson reports.VOA白宫高级记者Dan Robinson报道。