就象第一组小鼠一样，第三组小鼠活了15周后全部死亡。

All of these mice died by 15 weeks, like those in the first group.

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他们给第三组雄性小鼠雌激素，然后给与致癌剂，在这种情况下，肝癌的发生率与正常雌性小鼠相同。

The researchers also treated a third group of male mice with estrogen and then gave them the cancer-causing agent. In this case, rates of liver cancer remained the same as in normal female mice.

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