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重点讲解：
1.After all 毕竟
After all, we have only one earth, and we should do our best to protect it, not only for ourselves, but for future generations as well.
毕竟，我们只有一个地球；我们应该尽力保护它，不仅是为我们自己，也是为我们的后代子孙。
2.show up露面，显示
Soon as they show up, she disappears. What do you think happened?
就在他们露面后不久她就消失了，你觉得是发生什么？
