听到或读到crop这个单词时，我们马上联想到的对应汉语主要是作名词使用的【农作物；产量；庄稼】，或用作动词的【种植；收割；修剪；剪短；收成; 收获】，例如：
crop rotation农作物轮作
crop production农作物生产
crop yield 农作物产量
a fall in this year's coffee crop今年咖啡产量的下降
The crops are regularly sprayed with pesticides.农作物定期喷洒*虫剂。
We are looking forward to a bumper crop. 我们期盼着大丰收。
I started cropping my beans in July. 我7月份开始收割豆类作物。
crop与up连用，可以表示【出现】，尤其是出现不太好的情况、事物或结果。请看例句：
1. Problems have cropped up. 问题来了。
2. New difficulties cropped up. 新困难出现了。
3. A difficulty has cropped up at work. 作中突然出现困难。
4. Several matters have cropped up at the same time. 几件事挤在一块儿了。
5. Proper measures were taken as soon as the erroneous ideas cropped up. 错误思想一冒头，就及时采取了措施。
6. Something has cropped up and I won't be home tonight till late. 由于发生了一点意外的事情，今晚我要很迟才能回家。
7. I shouldn't be surprised if he cropped up this evening. 如果他今晚突然出现，我并不感到惊讶。
8. We can't get unwary just because nothing unusual has cropped up. 不能因为没发生什么问题就麻痹大意起来。
