pop up -用法

pop up

rise or appear suddenly or unexpectedly；show up突然出现

I haven't seen him for weeks， but I'm sure he'll pop up one of these days．我好几个星期没见他了，不过我肯定他这几天会来的。

He pops up all over the place， so you never know where to look for him．他什么地方都去，所以你不知道去哪里找他。