In this way,DDT before it was banned reached levels high enough to seriously disrupt the re production of many birds in North America,especially hawks,owls,and eagles.

• 通过这种方式，DDT在被禁止之前其含量已经很高，足以严重破坏北美许多鸟类的繁殖，尤其对于鹰和猫头鹰的破坏更为严重。