掌握了这些类型，在购买材料和装修施工时就会方便的多，下面我给各位列举出来吧。
Master these types, buying materials and decorate construction will be more convenient for you, I listed below.
俄勒冈州立大学的科学家们为23对夫妻设计了一个录像实验。这些实验者的基因类型只有研究人员知道，而实验观察者并未掌握。
Scientists at Oregon State University devised an experiment in which 23 couples, whose genotypes were known to researchers but not observers, were filmed.
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