虽然明信片的空间有限，但我可以为你提供一个简短的英语明信片范文，专门写给妈妈，字数超过20字，并尽量拓展到200字左右：
Dear Mom,
Wishing you a day as warm and bright as your smile. Your love is my constant star, guiding me through life's journey. Thank you for being my strength and my shelter. I cherish every moment we share. May this card bring you joy and warmth on your special day.
Love always,
[Your Name]
这段文字表达了孩子对妈妈深深的爱和感激之情，感谢妈妈像明灯一样照亮自己人生的道路，同时祝愿妈妈在她特别的日子里能感受到这份爱与祝福。虽然只有几行字，但包含了丰富的情感和祝福。
以下是一篇英语明信片范文，供您参考：
Dear Mom,
A simple postcard to say thank you for all your love and care. Your unending support means the world to me. I miss you and love you so much. Hoping to see you soon.
Your loving son/daughter,
[Your Name]
这篇明信片虽然只有20字左右，但表达了对妈妈的感激和爱，简洁而深情。当然，你也可以根据自己的情感和需要进行适当的修改和拓展，让明信片更加个性化和真挚。
