bob up

动词 bob up:

1. originate or come into being
   同义词：arise, come up

1. I have not seen him around for a while, but I am sure he'll bob up again soon.
   我有一段日子没见着他了，可我相信过不了多久他又会突然露面的。
2. She dive below the surface, then bob up like a cork again a few second later.
   她潜入水中，几秒钟後像软木塞一样又浮了上来。