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Bobby and Sam are doing a project.
波比和山姆在做项目
The earth is our home.
地球是我们的家园
We should protect it.
我们应该保护它
All students should know this.
所有学生都应该知道这点
Let's make a poster and tell them about it.
我们来画一张海报告诉他们这个吧
OK.
好的
I can help you.
我来帮助你
