[ ˈli:pˌfrɔɡd ] 过去式 过去分词 v. 跳背, 交替前进, 跃过( leapfrog的过去式和过去分词 ) v. jump across v. progress by large jumps instead of small increments 原型: leapfrog 英汉双解字典由 ECDICT 提供