It has been a difficult problem for technical personnel to estimate the yarn consumption ratio in the technological design of jacquard fabric.

提花织物工艺设计中的用纱比确定一直是摆在技术人员面前的一道难题。

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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。

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How to keep on talent has been a difficult problem of state enterprise human resources management.

如何留住人才成为国企人力资源管理中的一大难题。

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Once a problem has been defined by a category of solution it is difficult to break out of that category.

FORBES: SMAP: Solutions Masquerading as Problems