Today,the solution to the problem is so common that it is difficult to understand that there was a problem at all.

VOA: special.2010.07.14

Eliot would go further and say that there is no common form of modern speech, and that's the problem.

艾略特涉及的更加深入,他认为谈话并没有什么通常的形式，而这就是问题所在。

耶鲁公开课 - 现代诗歌课程节选

The problem is especially common along the west coast of Africa and in some ports in Asia and the Pacific.

VOA: special.2009.02.10

Farther west, the problem is with common carp.

VOA: special.2009.12.15