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The therapy of segmental bone defects remains a troublesome problem in orthopedic clinic.

节段性骨缺损的治疗一直是骨科领域的一大难题。

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The treatment of locally recurrent nasopharyngeal carcinoma(NPC) is a troublesome problem.

鼻咽癌局部复发的处理是一个棘手的问题。

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The selection of labor subcontractor is a troublesome problem came across to construction companies.

劳务分包单位选择是施工单位经常遇到的问题，通常以主观判断作出选择。