when problems crop up 惹事 ; 出现变故
begin to crop up 露出苗头
problems may crop up 突然出现的问题
to crop up 蹦出来
That crop up for air 为了氛围拔地而起 ; 为了空气拔地而起
PHRASAL VERB If something crops up, it appears or happens, usually unexpectedly. 意外出现; 突然发生
His name has cropped up at every selection meeting this season.
他的名字出人意料地出现在了本季的每次选拔会上。
Keep calm when problems crop up.
遇事冷静。
It's silly to paper over the problem; it will only crop up again one day.
把这个问题掩盖起来的作法是愚蠢的，总有一天还会暴露的。
Did something unexpected crop up?
是不是有一些意想不到的事情突然发生?
We've never been able to get that substantiated, but it does crop up in some of the commentaries.
VOA: standard.2010.08.11
Experts say the new methods also increase crop production up to five times more than crops that depend on rainfall only.
VOA: special.2010.02.08
The crop may not be ready for up to two years.
VOA: special.2009.07.07
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