除了作为对比的标准外，安慰剂本身就是一个研究主题。
Besides being benchmarks, placebos are a topic of research in their own right.
与国外同类标准物质的主要性能指标作了对比。
The main specifications of the standard are compared with those of several foreign standards.
与国外同类标准物质的主要性能指标作了对比。
The main specifications of the standard are compared with those of several foreign standards.
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