极其昂贵

• And so , it s important to be in touch with them and we were in touch before they went and we were in touch when they came back . i think they are very pleased with the quality of their discussions and i was certainly very pleased with the points they were able to get across
  希尔说，如果平壤需要能源， “我们有一个非常好的方案，可切实满足他们对发电量的最大需求，我们认为没有必要进一步扩大发电能力，尤其是通过核能这类极其困难、极其昂贵的项目。 ”