两年前，中国科学家发表全国糖尿病流行率大规模调查结果。
Two years ago, Chinese scientists published the results of a large national survey of diabetes prevalence.
方法使用分层抽样的方法在全国范围内抽取250家医疗机构开展大规模调查。
Methods A large-scale survey was conducted at 250 medical health units based on stratified sampling.
许多大规模的全国性调查已经揭示了日本人倾向于喜欢女儿，日本杂志上也发表过这一主题的实证论文。
The tendency for preference for daughters among the Japanese has been revealed by a number of large-scale national surveys. Empirical papers on the topic have also been published in Japanese journals.
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