| 2. | Organic compounds of chlorine such as ddt , for example , can literally be found all over the world due to atmospheric transport , even though many of these substances have long been banned in western industrialized countries , and they often remain and accumulate in parts of both terrestrial and aquatic food chains
例如有机氯，如ddt ，尽管在西方工业化国家里早已经被禁止使用，但是由于空气的传播，差不多在世界各地都能发现，并且经常残留和聚集在陆地和水生食物链中。 |
