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。
I consulted Milton on a number of occasions, and he was extremely generous with his time whenever issues involving China cropped up.
我求教过米尔顿好几次，遇上任何关于中国的事，他的时间是非常慷慨的。
He also points out, in passing, various questions of the sort which have cropped up early this year.
他也顺便指出了今年早些时候就突然出现的诸如此类的各种问题。
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