问题描述：
vehicle-treated怎么译
原句Rats were divided into 3 groups of 8 rats,according to their initial blood glucose concentration as follows:(1) normal ZL rats,(2) vehicle-treated ZDF rats and (3) ZDF rats treated with KIOM-79 (50mg/kg body weight).
原句Rats were divided into 3 groups of 8 rats,according to their initial blood glucose concentration as follows:(1) normal ZL rats,(2) vehicle-treated ZDF rats and (3) ZDF rats treated with KIOM-79 (50mg/kg body weight).
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