他把具有快速繁殖率的坎贝尔仓鼠分为4组。
He used Campbell hamsters, with a fast reproduction rate, divided into 4 groups.
用高繁殖率的坎贝尔仓鼠喂养两年的普通大豆，这些大豆广范用在农业生产中并且包含不同程度的转基因成分。
Campbell hamsters that have a fast reproduction rate were fed for two years with ordinary soya beans, which are widely used in agriculture and those contain different percentages of GM organisms.
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