had fallen the milk came from cows that ate grass where radioactive material had fallen求解这里的fallen 我在词典里面并没有看到相关的意义的解释呀!

had fallen the milk came from cows that ate grass where radioactive material had fallen求解这里的fallen 我在词典里面并没有看到相关的意义的解释呀!
had fallen
the milk came from cows that ate grass where radioactive material had fallen
求解这里的fallen 我在词典里面并没有看到相关的意义的解释呀!

had fallen the milk came from cows that ate grass where radioactive material had fallen求解这里的fallen 我在词典里面并没有看到相关的意义的解释呀!
落下啊,这些牛奶来自于那些吃了长在有辐射物质落下过的地方的草的牛

fallen 是 fall 的过去分词，意思和 fall 是一样的
句中使用了had+动词过去分词 构成的过去完成时 ，表示动作发生在过去的过去