A,keep up有这么个意思：（storm,sunshine,rain,etc．）go on；not stop；continue继续 The rain kept up for two days and the roads were flooded．雨持续下了两天,路面已积水成灾.
*If this storm keeps up,the crops will be destroyed．这场风暴要是持续不停,庄稼就要被毁了.
*I hope the weather will keep up．我希望这天气晴朗下去.