Its our duty to protect our environment. Where do we live? The earth. The earth is the only one place we live in. So you know how important the environment is.

But now, some people are harming the environment, like cutting down trees, drawing pictures on public walls, littering onto the ground. Its terrible if we still do it.

Now, its time for all the people in the society to protect the environment. Its our duty. It needs each of us to make a contribution to improving the environment. We should make our environment more and more beautiful.

保护环境是我们的义务。我们居住在哪里?地球。地球是我们唯一居住的地方，所以可想而知环境对于我们的重要性。

但是现在，很多人都在破坏环境，比如砍伐树木，在公共墙壁上乱涂乱画，随地扔垃圾。如果我们继续这样下去是非常可怕的。

现在，是人们保护环境的时候了，这是我们的义务，我们都要为改善环境做贡献，我们应该努力让我们的环境变得更好。