come up 和come about的区别

题目

come up 和come about的区别

答案

它们在意思上有区别.
come up 的意思是长出,上升,升职等；如：The snowdrops are just beginning to come up.雪花莲刚刚开始长出地面.
come about指的是发生.
如：how did this come about?这是怎么发生的?