Senate Republican leader Mitch McConnell of Kentucky expressed his disappointment with Specter's decision, saying it could undermine Republicans' ability to put a check on the Democratic majority.

VOA: standard.2009.04.28

So that's the second thing I've just highlighted here, is that I now have the ability to check whether it does the right thing.

你知道的，一个虚数,但是返回虚数就没有什么价值了,那么这是我想要强调的第二件事情。

麻省理工公开课 - 计算机科学及编程导论课程节选