下面这段话摘自《1991年总统经济报告》，请解释：“为保持强劲的经济增长。美国必须维持对新资本和新技术的高投资率。而高投资率要求适合的国民储蓄流。近年来巨大的联邦预算赤字降低了国民储蓄率。因而。正确的、增长导向的财政政策要求削减联邦预算赤字。” Explain the following statement from the 1991 Economic Report of the President：“To sustainrobust economic growth，the United States must maintain a high rate of investment in new capital and new technology．That，in turn，requires an adequate flow of national saving．The substantial Federal budget deficits of recent years have decreased the national saving rate．Sound．growth—ori—ented fiscal policy thus requires that the Federal budget deficit be reduced．”