The investigation, he wrote, had been challenging because there were very few research labs able to test for the chemical later identified as the cause of the smell.

他在信中写道，检查遇到了困难，原因是，对于经调查确认造成这种气味的化学物，几乎没有实验室能够测试得出来。

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All these serum samples were sent to the Institute Pasteur of Bangui for investigation, and were IgM negative by ELISA test.

所有血清样本都被送往班吉的巴斯德研究所进行检测，ELISA检测的结果均为IgM阴性。

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Methods: Various kinds of check-up and test and questionnaire investigation methods are used to evaluate the quality control system for measurement of being effective and reasonable.

方法采用各种考核、测试和有关问题问卷调查的方法，评价该教学质量控制体系的有效性、合理性。

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The competition watchdog said "there are competition problems in the audit market", and added that it could ask the Competition Commission to conduct a detailed investigation, because the "statutory test" for a reference to the Commission had been passed.

BBC: Can the stranglehold of Big Four auditors be broken?