[] used to describe a type of research that tests the effects of a new product, especially a new medicine. Neither the testers nor the people testing the product know who has received the real product and who has received a substance that does not contain any of it 双盲的（新药品进行实验时，被试者和实验人员都不知道哪些被试者使用了真正的产品，哪些被试者使用了安慰剂）◆a double-blind trial/study 双盲试验／研究➡blind trial