The intercondylar fractures of the humerus are rare and difficult to be treated.

肱骨髁间骨折为少见、难治性骨折。

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Nontraumatic osteonecrosis of the femoral head is a common disease in osteopathy clinic which is difficult to be treated.

非创伤性股骨头坏死是骨科临床上的常见病、疑难病。

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The composition of wastewater from textile industry is complex. The wastewater is very difficult to be treated and purified.

纺织行业排放的废水成分复杂，是最难净化处理的污水之一。

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The issues must be treated carefully, or they will be difficult and painful if an elected official has to deal with them.

VOA: special.2009.12.06

It is a disease which can be treated, but is difficult to diagnose.

BBC: NEWS | Health | A life plagued by painful periods

Job applicants have long memories, and it may be difficult to acquire that same quality talent later if candidates are not treated well now.

FORBES: What to Do When You Don't Hear Back After a Job Interview

Ask yourself: How would you want to be treated if you were on the receiving end of such a difficult message?

FORBES: How To Fire Someone Effectively But (Hopefully) With Dignity