Definition: to make water, air, soil, etc. dirty or harmful Level: B2
我们需要一种不会污染环境的燃料。
We need a fuel that won't ___pollute the environment.
它们大多数不污染环境，而且不会造成道路拥堵。
Most of them don't ___pollute the environment, and they don't create traffic jams on the roads.
工厂经常用化学废物污染河流。
Factories often ___pollute the river with chemical waste.
