"They said,without this service, NGOs [non-governmental organizations and agencies will be unable to reach operation areas in the east and south of the country, and it is an area that is particularly insecure and difficult,"

VOA: standard.2009.08.02

In the book business, there's something difficult about maintaining an independent operation.

在书店行业里,要想保持独立的经营模式,还是有些困难的

耶鲁公开课 - 金融市场课程节选