阅读下面的短文，然后按照要求写一篇150词左右的英语短文。
During summer holidays, two classmates, Tom and Peter, were traveling in the desert. As they were walking, they had an argument, and Tom was so angry that he slapped Peter hard across the face. Peter felt hurt, but without saying anything, he wrote down in the sand these words: “Today my best friend Tom slapped me in the face.”
It was very hot, but they kept on walking and walking until they found an oasis(绿洲), where they decided to take a bath. Suddenly Peter got stuck in the mire(泥潭) and started drowning. Seeing that, Tom rushed over and saved him without any hesitation. After Peter got recovered from the drowning, he wrote with a knife on a stone: “Today my best friend Tom saved my life.”
Feeling curious, Tom, who had slapped and saved his best friend, asked Peter, “After I beat you, you wrote something in the sand but just now you put down what I had done on a stone. Why?”
Peter replied: “When someone hurts us, we should take it down in the sand where winds of forgiveness can erase it away. But when someone does something good for us, we must carve it in stone where no wind can ever erase it.”
Hearing that, Tom was deeply moved and understood what Peter had said and what he had done.
[写作内容]
下面请你以“What I have learnt from Tom’s understanding”为题，谈谈你读了这个故事以后的感受。内容要点包括：
1．以约30个词概括上述故事的要点；
2．以约120个词就Peter“被打”和“被救”后的举动发表你的看法，内容包括：
（1）Tom 为什么感动了？他到底明白了什么？
（2）你从这个故事中学到了什么？简要说明其理由。
[写作要求]
可以使用实例来支持你的论点，也可以参照阅读材料的内容论述，但不得直接引用原文中的句子。
