学个词 Learn A Word:1229 step up

　　今天我们要学的词是step up. To step up, 是加强的意思。 "Our team stepped up our defense in the second half and won the game," 我们队下半场比赛加强防守，最后赢得了比赛的胜利。 "Former Fed Chairman Alan Greenspan is stepping up his call for Congress to let the Bush-era tax cuts expire," 前美联储主席格林斯潘加大呼声，要求国会让布什任期内通过的减税法案到期自动失效。 "France stepped up its efforts to block north African migrants from entering its territory from Italy," 法国加大力度，阻止非洲北部的人从意大利进入法国。好的，今天我们学习的词是step up...