求翻译：Wistar (鼠龄3个月以上)大鼠120只,购自吉林大学白求恩医学院动物中心，体重(220 ±40) g,雌雄不拘,随机分为三组,A组、B组为对照组,C组为实验组,各为40只。是什么意思？

[object Object]

on aging Wistar (mouse) rats more than 3 months, only 120 purchased from Jilin University Bethune medical school animal center, weight (220 ± 40 g, jumps 14-21) and randomly divided into 3 groups, the Working Group on B A group, the control group, C for experimental groups, each group is only 40.

正在翻译，请等待...

Wistar (age 3 months) in rats with 120, purchased from Bethune Medical College of Jilin University Center for animals, weight (220 ± 40) g, female and male either, randomly divided into three groups, group a, b, as control groups, group c for the experimental group, each for a 40.