pop up   (TTS發音)

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

    I haven't seen him for weeks， but I'm sure he'll pop up one of these days. 我好幾個星期沒見他了，不過我肯定他這幾天會來的。

    He pops up all over the place， so you never know where to look for him. 他什麼地方都去，所以你不知道去哪裡找他。