关于白色污染 White Pollution

Yesterday, our school asked all of us to learn from Leifeng. All of us had to pick up the rubbish in the river. I think it must be finished very soon because believe there will be very little rubbish in the river. But when we arrived there, I found that there are many plastic bags in the river. Our teacher told us it is called white pollution. It was very horrible. We busied for a whole day. I realized the importance of clearing up white pollution after this activity. 
昨天，我们学校要求我们所有人学习雷锋。我们所有人都得去河里捡垃圾。我以为很快就可以完成了，因为我觉得河里的垃圾应该很少。但当我们到达那里时，我发现河里有许多塑料袋。我们的老师告诉我们，这就是白色污染。真是太可怕了。我们忙了一整天。这次活动之后我意识到了消除白色污染的重要性。