与此同时，华盛顿州立大学的研究表明中毒效应（就像与杀真菌剂或杀虫剂接触）能引起老鼠的生物学改变并将持续至少四代。

• Meanwhile research at Washington State University points to toxic effects ? like exposure to fungicides or pesticides ? causing biological changes in rats that persist for at least four generations.