这两个单词在中小学阶段主要有下面两种词性：1.cross v.意思是“横越,横跨”.例句:It is said that the enemy troops have already crossed the border.
据说敌军已越过边界.
2.across prep.意思是“越过…；穿过…；跨越…；横过…； 从一边到…的另一边”.例句:The dog swam across the river.