The real hard part, of course, is solving an open problem.
当然，真正困难的部分还是是解决热点问题。
So far, for any graph, the Total Coloring Conjecture is still an open problem.
到目前为止，对于一般的图，全着色猜想仍然是一个公开的问题。
Machine translation is an open problem while its evaluation is also very difficult.
机器翻译是项很困难的研究课题，而机器翻译评价也不是一件容易的事。
We should come to the problem with an open mind.
我们处理这个问题时不应抱有偏见。
Problem is that I have an open bookcase, I put mothballs have no effect?
问题是，我有一个开放式书柜，我把樟脑丸没有任何效果？
However, it's a good idea to keep an open mind on the problem.
不过，对这个问题最好是不抱偏见。
The existence of black and white contract is an open secret in the construction market, and is also a tough problem in the contract management.
黑白合同的存在是建设工程市场公开的秘密，也是合同管理中一个棘手的问题。
The problem of lexical difficulty remains an open question, though scrutiny has already been given.
尽管人们有所研究，但词汇难度问题仍然悬而未决。
The problem of lexical difficulty remains an open question, though scrutiny has already been given.
尽管人们有所研究，但词汇难度问题仍然悬而未决。
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