求翻译：Sam was ill, so he didn't go to school this morning. The doctor said that he had a bad cold and couldn't go to school in two days. He was very worried about his class. Lena was his best friend. She went to help him after school with his class. She was very helpful.Sam wouldn't worry about that any more. When Sam went back to school, he could catch up with the others. They were both happy.是什么意思？

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