We have a representative sample.
我们有一个代表性的样品。
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A recent study of a nationally representative sample of American students found that black students with the same standardized test scores as their white classmates were less likely to be nominated for gifted programs if they had a non-black teacher.
最近对具有全国代表性的美国生样本进行的项研究发现,如果黑人生的老师不是黑人, 那么与白人同具有相同标准化考试成绩的黑人生被提名参加天才项目的可能性较小。