最佳答案
A letter written by a nurse to her son can start like this: "Dear Son, I hope this letter finds you well. I want to share my thoughts and feelings with you. I have been on the frontline of fighting against diseases, and it has been a challenging but meaningful experience. I miss you so much and I am proud of your growth and understanding during this time. I have a responsibility to care for patients, just as I have a responsibility to love and guide you. Love, Your Mother." This is just a simple example. You can add more specific details and emotions based on your own situation.