Critics say the trial's results may have been accidental and whatever benefits the vaccine might produce may have limited effect.

VOA: standard.2009.10.20

The problem with partnerships, generally, has been that they don't have limited liability.

通常合伙制企业的问题是,合伙人具有无限责任

耶鲁公开课 - 金融市场课程节选

The problems have not been limited to developing countries.

VOA: standard.2010.02.22