Idries says another obstacle to dentente between Iraq's Shi'ites, Sunnis,and Kurds is the existence of four-million Iraqis, living abroad, many of whom are disenfranchised.

VOA: standard.2009.10.26

Milton's own faculty of memory - this is the idea that I'm going to be floating here - seems to provide something like, or pose a stumbling block or an obstacle for, his attempt to write an original, divinely inspired poem.

在这里我想说,弥尔顿自己的记忆系统,似乎想提供某种东西，或者想在他写出一部原创的，伟大的诗作的尝试上设置一个障碍。

耶鲁公开课 - 弥尔顿课程节选

At a recent driving event near Washington,D.C., teenage drivers tested their skills on a closely-monitored obstacle course to compare how they drove with - and without - distraction.

VOA: standard.2010.06.24

The United States,which is a sponsor of the Middle East peace talks, says Israeli settlements are an obstacle to peace, and the issue has strained relations with Israel's right-wing government.

VOA: standard.2009.12.28