pigeons词根词缀

The now extinct passenger pigeon has the dubious honor of being the last species anyone ever expected to disappear. At one point, there were more passenger pigeons than any other species of bird. Rough 26 of their population went as high as five billio

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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