网络释义
... differentiate v.区别；区分 difficult adj.困难的；难的 diagnosis n.［复数,diagnoses］诊断（法），诊断结论；判断，判断结论 ...
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...的过程做个介绍:清华大学 宋斌恒 46Lemma34.8 如果L是一个语言,如果存在一个L’属于NPC,且满足 L’ ≤p L,则 L是NP-难的(NP-hard),如果进一步有L是NP则L属于NPC。
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1983年,Garey与Johnson证明:确定一个任意图的 交叉数问题是NP-困难的（NP-complete）。计算一个给定图的交叉数也是非常困难的,目前,只有很少图族的交叉数是已知的。
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双语例句原声例句
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让他谈话并不难—难的是让他住口！
It's not hard to get him talking—the problem is stopping him!
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我从未经历过像那次一样难的期末考试。
I never went through a final exam that was as difficult as that one.
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这是个相当难的问题。
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I realize I've given you some difficult mathematics, but--it's not that difficult actually-- but I kind of went through it quickly.
我发现我给了你们一些比较难的数学公式，不过，并不是想象的那么难-,我很快就把它们讲完了。
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and she's now playing some pretty fairly difficult things considering that she has only taken for a couple of years. So,
尽管她才学了几年，她现在已经可以弹奏比较难的曲目了。所以，
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The first study, the one with the deceptive dolls with the big shoes and little shoes, is actually fairly difficult.
第一个研究用了有欺骗性的,穿着大鞋和小鞋的洋娃娃,实际上是非常难的
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