But Sow says it's difficult to get adults to change, for example, to stop using pesticides on their tomatoes and other crops, which he says is a persistent problem in the village.

VOA: standard.2010.04.01

Her statement points to a persistent worry, and it's a worry that exists even now in the twentieth century about the nature of Milton's power.

她的陈述不断透露着忧虑，这种忧虑一直持续到现在20世纪,关于弥尔顿之力量的本性的忧虑。

耶鲁公开课 - 弥尔顿课程节选

I'm narrowing it down. It's getting a little silly but you know I'm going to really be persistent and just follow the rules here of binary search, rather than jumping to conclusions.

按照二分法的规则来做的,而不是直接得出某种结论,很明显这儿我的目的是什么？,显示这两个相同的东西。

麻省理工公开课 - 计算机科学及编程导论课程节选

"Turkey's persistent denial and inability to face, or unwillingness to face up to its history is very disruptive in all kinds of ways - in terms of international relations, in terms of its own internal politics - and it also prevents it from really recognizing how do you deal with minorities."

VOA: standard.2010.03.19