1、They throw rubbish into rivers , too.他们还乱扔垃圾到河流理去。

2、Right side,please.请靠右行。

3、It's our duty to save water.节约水是我们每个人的责任。

4、Something must be done to stop the pollution.人类必须采取一些措施来制止污染。

5、It's everyone's duty to love and protect the environment.爱护和保护环境是每个人的责任和义务。

6、Let’s do our best to make it more beautiful.让我们尽力让它更美丽。

7、We don't need to do big things—we can start out small.我们不需要做大事，我们可以从小事做起。

8、The federal government promulgated the Clean Water Act and the Clean Air Act.联邦政府颁布了《水清洁法》和《空气清洁法》。

9、Protecting the environment is every man's responsibility.保护地球环境是每一个人的责任。

10、We don’t need to do big things—we can start out small.我们不需要做大事，我们可以从小事做起。

11、if everyone could make a big contribution to environmental protection, our home will become much more beautiful.如果每个人为环境保护作出一点贡献，我们的家园会变得更加美丽。

12、The most important question in the world today is pollution.当今世界最重要的话题就是污染问题。