People make the air dirty when they drive cars.
当人们驾驶汽车的时候，空气被弄脏了。
Waste gases from cars and factories make the air dirty.
废气从汽车和工厂，使空气很脏。
People make the water and air dirty.
水和空气都受到了人们的污染。
We should call on people not to pour the dirty water into the river or make the air terrible.
我们应该呼吁人们不要脏水倒到河里或使空气可怕。
Poisonous gasses from factories also make the air so dirty.
从工厂有毒气体也使空气这么脏。
Poisonous gasses from factories also make the air so dirty.
从工厂有毒气体也使空气这么脏。
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