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。
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。
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