I'm usually single, and that is usually not a problem.

VOA: special.2009.12.28

to the... -Em... I'm not aware of any sort of...arguments with the say that it's a single economic zone.

成为。。。，-嗯。,我没听过有人反对,这样一个单一经济区的存在。

普林斯顿公开课 - 国际座谈会课程节选