单词：crop up
crop up的用法和样例：
例句
- In a dozen states revolt flared up.判乱在十几个州里突然发生了。
- But it just popped up right in front of me.但它突然发生在我面前。
- He keeps bobbing up in the most unlikely places.他总是在极不可能出现的地方突然出现。
- A difficulty has cropped up at work.工作中突然出现困难。
词汇搭配
- crop up突然发生
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