由于有关此案的材料全部丢失，进一步的调查受到了阻碍。
Further investigation was hindered by the loss of all documentation on the case.
我也在男生中进行了一项有关他们对人际关系态度的实地调查。
I also conducted a field study among the boys about their attitude to relationships.
联邦调查局保存了有关巴勃罗·毕加索的大量档案。
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