While methemoglobinemia clears spontaneously over several hours, hemolytic anemia may take several weeks to resolve.

铁血红蛋白症会在几后自动消失，而溶血性贫血需要几期才能解除。

It is well known that the nitrate and nitrite from environment is causally related to infant methemoglobinemia and esophageal cancer.

环境中的硝酸盐暴露与铁血红蛋白血症及食管癌的病因关联已为人们熟悉。