Pigeons and pollution are both common blights in cities around the world, but a group of engineers in London are hoping the birds can help them tackle problems with air quality. 对世界上许多城市来说，鸽子和污染问题都是常见的危害...
43 空气污染能引发心脏病 DATE=7-6-01 TITLE=ENVIRONMENT REPORT - Pollution Linked to Heart Attacks BYLINE=Cynthia Kirk （Start at 59" ）This is Bill White with the VOA Special English ENVIRO...
