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

VOA: standard.2009.05.23

So sometimes you can have a team like Manchester United can play against a team

所以，有时你可以看到像曼联队这样的球队会对阵一个球队，

关于足球联赛 - SpeakingMax英语口语达人

If you have unique skills and are interested in traveling to underdeveloped, sometimes dangerous regions, the United Nations Volunteers may have a job for you, sometimes in a country consistently beset with disasters.

CNN: Site Seer: Help others in need, and help yourself

Kagan acknowledges that the United States sometimes has to support authoritarian regimes to further its interests.

NEWYORKER: After America

Television news stories in the following days sometimes showed bulging barrooms across the United States and other times empty ones in tourist destinations.

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