to crop up 突然出現(非正式)
英文釋義
(INFORMAL) To occur suddenly and unexpectedly. (Note: often describing the appearance of problems).
例句
My new house looked fine until it started raining yesterday and a dozen leaks in its roof cropped up.
我的新房子看上去一直挺好,直到昨天開始下雨,屋頂突然出現了十幾道裂縫。