But one aspect of the pollution that is very noticeable in this windy city is the plastic bags that swirl gracefully among the tall buildings till they are captured by some tree branch or that skitter along the roadways and sidewalks until they are picked up by the sanitation workers . but too often these ubiquitous plastic bags end up in the city ' s potentially lovely waterways and , just as bad , in farmers " fields 但是,在这个多风的城市里有一种污染非常显眼，那就是塑料袋，它们或是优雅地盘旋于高耸的楼宇之间，最后挂落在树枝上或是掠过马路和便道，直到环卫工人捡起来为止但更为经常的是，这些无处不在的塑料袋最后飘落在本应是宜人可爱的水道上同样糟糕的是，它们还常常掉落在农田里。
