He notes,however, that such purchases are impossible to do if the Kremlin continues to envision a conflict with the West.

VOA: standard.2009.03.20

If you have a computer that plays chess and you want to explain how the computer plays chess, it's impossible to do so without talking about the programs and mechanisms inside the computer.

如果你有一台能下国际象棋的计算机,你想要解释计算机是如何下国际象棋的，如果你不谈程序以及计算机的内部结构,那你就不能对它如何下国际象棋,给出解释。

耶鲁公开课 - 心理学导论课程节选

Oftentimes, inventions that seem, in the abstract, to be good ideas may be impossible because something that you have to do to make it actually come into practice is too expensive and so it's not economic to produce the invention.

通常在理论上,创新固然不错,但却很难实现,因为把创意变成现实,花费会相当的昂贵,实现这样的创意非常不合算

耶鲁公开课 - 金融市场课程节选

He says president is unlikely to do so. The lack of concrete presidential action leads Nemtsov to conclude that the democratization and modernization of Russia remain impossible.

VOA: standard.2009.11.12

s very important but it's also pretty nearly impossible because the difficulty of the terrain, the people who are divided by this border do not recognize the border and the Afghanastan has never recognized it as an international border.

但其实也是几乎不可能的，It’,因为那里的地形很复杂，被这个边境线所分开的人们并不认可这个边境线,阿富汗人不认可这个边境线。

普林斯顿公开课 - 国际座谈会课程节选

"Suddenly,we realized that we had the capacity, and the encouragement, as Rotary clubs to do major projects, then the eradication of polio was no longer an impossible dream."

VOA: standard.2010.08.02

Because she has really organized that Democratic Party and gotten them to do things in the House that no one else could do and that people said was impossible in this day and age in politics."

VOA: standard.2010.05.11