他研究了11个非洲国家的人口记录和医疗信息。
He examined population records and medical information from eleven African countries.
他们希望教育部记录哪些孩子是左撇子以及这些孩子的受教育程度，因为这些孩子占人口的10%左右。
They want the department of education to record which children are left-handed and what their educational attainments are, since they make up some 10% of the population.
17世纪后半期的村庄人口普查记录非常完整。
Village census records for the last half of the 1600's are remarkably complete.
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