It may be difficult to believe, but grades are relatively unimportant in graduate school. Ultimately, you will be judged almost exclusively on your thesis.

或许你很难相信，研究所课程的分数并不是很重要，最终的评估是你自主完成的论文。

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Some scientists believe it will be difficult to make robots really think like a human.

一些科学家认为，要让机器人真正像人类一样思考是很困难的。

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Predictably, being faced with hard, empirical data about your social world — particularly if it contradicts what a user believes, or wants to believe — can be difficult.

可以预见的，要面对关于自己社交世界真实，却又残酷的数据-特别是当它否定了一个用户所相信的，或者想要相信的东西的时候-是很困难的。

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Most of us find that rather difficult thing to believe that the person could be constantly changing in this way without having any way at all to tell.

大多数人很难相信,人可以不断地,变化，而且是以这种,无法揣测的方式变化。

耶鲁公开课 - 死亡课程节选

The last point would be difficult to believe for any visitor to his spartan, cramped apartment where he lives with his infirm wife.

ECONOMIST: Reformers struggle against the odds

It may be difficult to believe that the NFL could ever fall from its perch or that there is anything to stop it from situating itself on a greater, more global one.

FORBES: At The Top Of The Game, Is The NFL Positioned To Fall?

It may be difficult to believe, but in all of Africa, only two cities have subway systems: Algiers, which just launched its metro at the end of 2011, and Cairo, where the subway has been around since 1987.

BBC: Subway systems by the numbers