[] a type of research that is done to see the effects of a new product, especially a new medicine. Two groups of people believe that they are testing the product but one group is given a substance that does not contain any of it in order to compare the results with the group who are testing the real product.盲法测试（一种测试新产品的研究方法，尤指新药的研究方法。两组人相信他们正在测试产品，但其中一组只给了安慰剂，目的是与测试真正产品的一组的结果相比较）➡double-blind