In the case of RV144 the boosting vaccine, AIDSVAX, had been the subject of a previous trial in Thailand, and also of one in North America and Europe.

就RV 144来说，增强疫苗AIDSVAX是先前泰国实验的受试对象，也是在北美和欧洲的一项实验的对象。

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The actual tests would employ the well-honed methods of operant conditioning, developed initially on pigeons, in which the test subject has first to work out what is going on by trial and error.

实际的测试会采用精确的操作性条件反射方法，测试对象首先要清楚实验的过程和错误。

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The procedure is the subject of a National Institutes of Health study called the SCOT trial, for Scleroderma: Cyclophosphamides or Transplantation?

国立卫生研究所正在进行一个称为SCOT的试验项目——对于硬皮病：环磷酰胺还是移植？

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In addition, recruitment of study subjects can be easier in developing countries, where a trial subject may get more than a year's pay to participate or participation could be his or her sole means of being able to get treatment, the authors said.

CNN: Growth of clinical trial outsourcing raises issues

Any trial remains subject to official approval by both England and South Africa's national cricket boards.

BBC: England Tests may trial referrals

Viral loads of the patients remained stable or decreased during the nine month trial - and one subject showed a sustained dramatic decrease in viral load.

BBC: Cell infected with HIV