occur: 耗时:0ms 洪恩在线
单词简介 详解与例句 相关短语 同义词 反义词
词缀: oc-向,在前;在...之上to, toward, before, in fornt; upon, over
词根: curr发生;产生to run,happen
动词进行时: occurring 过去式: occurred 过去分词: occurred