We should stop cutting down so many trees.

我们应该停止砍伐这么多的树。

Ms Guo: Look at this picture. What is it?

郭老师：看这幅图片。它是什么？

Kitty: It’s the Earth.

凯蒂：它是地球。

Ms Guo: The green and brown parts are forests and land. What are the blue parts?

郭老师：绿色和棕色的区域是森林和陆地。蓝色的区域是什么？

Joe: I think they’re oceans.

乔：我认为它们是海洋。

Ms Guo: Yes, they are. The Earth was very clean and beautiful in the past, but now some parts are dirty. Can we do anything to help the Earth?

郭老师：是的，它们是。在过去地球是非常干净和美丽的，但是现在一些区域是脏的。我们能做一些事来帮助地球吗？

Alice: Yes. We should stop throwing rubbish into rivers.

艾丽斯：是的。我们应该停止向河里扔垃圾。

Peter: We should stop cutting down so many trees.

彼得：我们应该停止砍伐这么多的树。

Kitty: We should stop using plastic bags.

凯蒂：我们应该停止使用塑料袋。