The donated milk was probably to blame: recent laboratory research on rats has shown that rats briefly exposed to the substances aflatoxin tend to develop liver cancer when fed casein, a milk protein.
This was demonstrated in a laboratory experiment with rats.
这点通过在实验室中用老鼠做试验得到证明。
《柯林斯英汉双解大词典》
3
The scientists gave ethanol to laboratoryrats and found that the stomach mucous membrane of those which had eaten strawberry extract for the previous ten days suffered less damage.