To write feedback on the Foundation Warm Heart Card, please refer to the following structure:

1. Thanks and greetings: Express sincere greetings and thanks to the recipients.

2. Self-introduction: briefly introduce yourself, including your name, experience of receiving assistance or contact experience with the Foundation's warm heart card. You can also mention how you know about the foundation or how their services have helped you.

3. Express gratitude: Express gratitude and recognition to the warm heart card of the Foundation. Emphasize the positive impact of their services on your personal life and praise their work.

4. Describe the experience in detail: share the specific experiences and feelings in the process of communicating with the Foundation Warm Heart Card or receiving services. You can mention what they helped, what they solved or improved, and their support and concern in difficult times.

5. Emphasize the impact: explain the positive impact of the Foundation Warm Heart Card on your life and the importance of their services to the community and society. You can share the positive contributions and changes that you think the Foundation Warm Heart Card has made in social welfare.

6. Provide suggestions or comments (optional): If you have any suggestions or comments, you can put them forward in this section. But please be sure to express it in a positive, constructive and objective way to help them improve their service quality.

7. Thanks and blessings again: Thank you again for the warm heart card team of the Foundation, and express your blessings and support for their future work.

8. Polite words at the end: Use appropriate polite words at the end of the letter, such as "sincerely" and "sincerely wish".