keep up keep on keep doing的区别?

问题描述:

keep up keep on keep doing的区别?

keep up 保持,继续,维持,跟上(时代)
keep on 继续进行(接连,反复,继续)
keep doing 一直做,继续做

keep up 保持,继续,维持,跟上(时代)
keep on 继续进行(接连,反复,继续)
keep doing 一直走,继续做