U.S. intelligence officials concluded with a high degree of confidence that the hostages were killed in this January drone strike.

美国情报官员充满信心地得出了结论，人质在是一月份的无人机袭击中被误杀的。

How can I say that with any degree of confidence?

我怎样才能有信心地说出这句话呢？

Commerce and manufactures, in short, can seldom flourish in any state, in which there is not a certain degree of confidence in the justice of government.

简而言之，商业和制造业很少能在任何对政府的正义没有一定程度信心的国家蓬勃发展。

British officials say they have been monitoring the activity for at least a year and now have a high degree of confidence in attributing the actions to the Russian state.

英国官员称，过去至少一年的时间里，他们一直都在监视该行动，现在他们有充足的把握是俄罗斯开展了该行动。