1.突然发生;出现
1.to happen suddenly or unexpectedly
2.if a name or subject crops up, someone mentions it
1.For instance, misprints often crop up in the papers simply because their elimination has not been tackled as a serious job .
例如，报上常有错字，就是因为没有把消灭错字认真地当做一件事情来办。
2.Whenever difficulties or problems crop up in their work every one of us lends a helping hand.
每当他们的工作中出现困难或问题时，我们人人都出力帮助解决。
3.Should complacency crop up, people do not hesitate to point it out.
万一发生骄傲自满的情况，大家都要毫不犹豫地指出来。
4.Critical expressions can crop up in other contexts as well: consider the following code.
临界表达式可能在其他上下文中突然出现：考虑如下代码。
5.All of us ought to be able to brace ourselves for the predicable challenges and setbacks that crop up everyday .
我们每天都应该让自己做好准备，迎接可以预见的挫折和挑战。
6.Errors crop up in the dispensing of medications: It's easy to confuse products with similar names(for example, Zantac and Xanax).
确定你拿到的药是正确的，因为配药时可能会突然出现错误：有时很容易混淆名字相似的药物（例如：Zantan和Xanax）。
7.As problems crop up, he said, "one thing we're working on with our library partners is a method to scan inpidual pages. " .
Google在遇到模糊不清页面时采用的算法已经得到改善，并且一旦出现这种问题，我们与合作图书馆所做的工作就是扫描单独的每一页。
8.But then we move on to the next stage of the training, where some of the problems which actually crop up on the street are imitated.
然后进入训练的下一步：模拟在街道上实际会出现的一些问题。
9.It had never occurred to her that a new possibility would crop up abruptly.
她万万没有想到会突然出现一种新的可能性。
10.Mr Jeffery says MI6's files are the "holy grail" , hitherto glimpsed only indirectly, when its reports crop up in declassified MI5 files.
杰弗瑞说军情六处的档案简直就是“圣盘”，到目前为止只能间接看看。