This turns out to be a hard problem.
这其实是一个很难的问题。
这是个困难的问题。
Clustering has historically been a hard problem to solve.
集群一直以来都是难以解决的问题。
But I want to end by mentioning the hard problem as it is known now.
最后，我想再讲一个众所周知的难题。
Simulating a quantum computer on a traditional classical computer is a hard problem.
在一台传统的经典计算机上模拟量子计算机是个难题。
Name rectification is a hard problem.
正名是一个困难的问题。
Is cancer just an impossibly hard problem?
癌症真是一个无法解决的难题吗？
He is clever enough to work out the hard problem.
他很聪明，能自己解出这道难题。
Test set problem is a NP-hard problem with wide applications.
测试集问题是一个有着广泛应用的NP难问题。
The fill in problem for graphs is a well known NP hard problem.
图的最小填充问题是熟知的NP-困难问题。
Power network planning is a NP hard problem difficult to be solved.
电网规划是一个较难解决的NP难问题。
The second part is the commercial bribe crime certain hard problem analysis.
第二部分是商业贿赂犯罪若干疑难问题研析。
Automatic test paper generation is a NP hard problem while restrictions exist.
试题库自动组卷问题是一个NP难题。
Combining of network technology and PLC technology is good method to solve this hard problem.
运用网络技术和PLC技术结合则能很好的解决这一难题。
Data mining in incomplete information system is a hard problem but inevitable in uncertain decision.
不完备信息下的数据挖掘是一个难题，但它在实际决策中是不可避免的。
Data mining in incomplete information system is a hard problem but inevitable in uncertain decision.
不完备信息下的数据挖掘是一个难题，但它在实际决策中是不可避免的。
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