请问"come about"和"come up"的区别

请问come about和come up的区别 come up 和come about的区别 come about come out,come along,come about,和come acrros的意思分别是什么? 还有两个选项是come about和come down 试举例说明come about 和come around的用法 come about和 happen用法的区别 take place 和 come about 的区别 come up/come about/come through/come out come about是什么意思啊? come about 是什么意思? come about中文意思 come about 的意思 come out与come about的区别 come along 与come about的区别? come up 和come about在做‘发生’之意的时候的区别come about用于抽象事物,come up用于具体事物,是这样的吗? 英语短语翻译come along ,come across ,come about come over .come out.come about分别是什么意思