The study used a "cross-over" design, which allowed each subject to serve as his or her own comparison group.
这个研究试验采用了交叉设计，这样每一个研究对象的对照组就是他（她）自己。
Walgren goes over what White said about the Beagle study under direct and cross.
Walgren过去说的关于“小猎犬号”白酒在直接和交叉研究。
Two parallel group trials found no significant difference in machine usage, whereas a cross-over study found a significant difference.
两项平行组别试验未发现机器使用有意义的差异，然而，一项交叉试验显示有意义的差异。
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