There is a consensus that too many other factors contribute to the city's pollution, and the more practical matter on everyone's mind.

对，污染是由多方面的因素导致的，而且疲于为生计奔波的人们也不可能把太多的精力投入到污染治理上。

One major and very public challenge for the South American city, pollution, especially in the water, in places like Guanabara Bay where sailing events are held.

南美城市面临的一项重大且非常公开的挑战是污染，尤其是水污染， 尤其是在举办帆船比赛的瓜纳巴拉湾等地。