首先分别阐明了中外预防犯罪的概念，并加以比较。
First, it elaborates respectively the Chinese and foreign concepts of crime prevention and makes a comparison between them.
每位患者最多观察5天，随访2周，分别统计每组患者的疗效并加以比较。
Observation of each patient was up to 5 days, follow up 2 weeks. Added up the statistical effect of each group and compared.
分别根据两种类型的基因频率资料，计算3个群体间的标准遗传距离并加以比较。
The standard genetic distances among 3 populations based on two type of gene frequency were calculated and compared.
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