The specimens for analysis were chosen at random 供分析用的样品是随意挑选的。
2.
This group was matched with 13 randomly selected youngsters of similar age and diabetes duration who had been intensively treated with insulin and served as a control group 与该组对应的另外一组是由13名随意挑选的相近年龄、相近病程的孩子组成,这一组孩子采用的是胰岛素强化治疗,称为控制组。