"These difficult to reach populations frequently go underground and remain not visible to the medical delivery system,"

VOA: standard.2009.11.15

I go to Amsterdam--not frequently, but I've been there ten or twelve times, or something.

我去过阿姆斯特丹,虽然并不常去,但也去过大概十次或者十二次

耶鲁公开课 - 欧洲文明课程节选

So since that's the easiest scenario, you can probably be sure it's not going to be too frequently that you're just given the energy, right, that might be too easy.

所以既然那是最简单的情况，你可以确信只给你提供能量值的,这种情况不太可能发生太多，对，因为那太简单了。

麻省理工公开课 - 化学原理课程节选

He says frequently they are taken advantage of and exploited and that is not just.

VOA: standard.2010.03.21

Aristotle takes his stand from within politics and the regime of which he is a part. Of course we all know contemporary political scientists are not neutral. They frequently insert their views values we call them value judgments we call them.

亚里士多德的立场却是置身于,政治与政体之内,让自己成为其中的一部份，当然,我们都知道当今的政治科学,并非如此中立，他们常硬加入,他们自身的观点与价值，他们的价值判断。

耶鲁公开课 - 政治哲学导论课程节选

Frequently, it is the victim of trafficking who is criminalized, not the trafficker.

VOA: standard.2009.08.21