Separation of Cu, Zn and sulphur has been a difficult problem for a long time.
铜锌硫多金属矿石分离历来是选矿界的难题。
This has been in a departmental budget difficult problem.
这一直是部门预算中的一个难题。
A pun interlingual translation has been of a difficult problem.
双关语翻译一直是语际转换中的一大难题。
A pun interlingual translation has been of a difficult problem.
双关语翻译一直是语际转换中的一大难题。
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