Even the bottom of the river was full of rubbish. 即使河底都充满垃圾
Everyone in town should play a part in cleaning it up.城里的每个人都应当尽一份力把它清理干净
The air is badly polluted because there are too many cars on the road these days
To cut down air pollution, we should take the bus or subway instead of driving.
I used to be able to see stars in the sky. 我过去能在天空中看到星星
The air has become really polluted around here. I’m getting very worried.
No scientific studies have shown that shark fins are good for health.