crop up

动词 crop up:

1. appear suddenly or unexpectedly
   同义词：pop up, pop

1. Another development related to the electronic cottage is the emergence of electronic "halfway houses" which are beginning to crop up across the country.
   与电子业有关的另一项新发展是电子“中间站”的出现，这种中间站正开始在全国各地涌现出来。
2. A difficulty has cropped up at work.
   工作中突然出现困难。