Yet,when a musician played with Duke Ellington, he usually stayed, sometimes for many years.

VOA: special.2010.08.15

There has been, over the years a lot of turf battles between the SEC and the CFTC because it's sometimes unclear whether something is a security or a futures.

历年来,证券交易委员会和期货交易委员会的领域战争层出不穷,因为有时候很难说,一个东西究竟是证券还是期货。

耶鲁公开课 - 金融市场课程节选

So sometimes, if you miss a class, you can just kind of check in earlier years, like lectures,

所以有时候，如果你错过了一节课，你可以看看前几年的讲座，

开放式的课程？ - SpeakingMax英语口语达人

Eight years into the Afghan war, Afghan troops and their U.S.advisers have settled into a sometimes tense relationship.

VOA: standard.2009.12.13

Sometimes it takes 4 or 5 years in order to get some level of competency.

有时候它需要4到5年才能达到一定的水平，

学第二外语的时候 - SpeakingMax英语口语达人

He says in recent years the United States has sometimes failed to live up to that responsibility.

VOA: standard.2009.05.23