根据权威性和时效性优先原则，以下是三篇适合200字左右的英语感谢信范文，涵盖不同场景：
一、感谢老师（教育场景）
Dear Teacher,
I’m grateful for your guidance in English class. Your passion for the subject inspires me to share my thoughts with the world. Thank you for creating an engaging learning environment and for your patience in helping me overcome challenges. Your dedication to our growth is truly appreciated.
二、感谢医院工作人员（医疗场景）
Dear Staff,
I want to express my heartfelt thanks for your support during my recent hospital stay. Your expertise, kindness, and genuine concern helped me recover quickly. I am especially grateful for the encouragement you provided and the assurance that helped me regain my confidence. Please accept my sincere appreciation.
三、感谢企业合作（商务场景）
Dear [Boss's Name],
Thank you for the opportunity to discuss the collaboration with your team. I appreciate the detailed account of your activities and the insights shared. Your commitment to excellence and the supportive work environment are commendable. I am confident that our partnership will be mutually beneficial.
注意事项：
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根据具体场景调整称呼（如老师、医生、老板）；
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突出具体帮助行为（如耐心指导、专业支持、热情接待）；
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保持简洁，避免冗长。