"Thank you, my dear mother" 的简短表达是 "Thank you, Mom"。

"Thank you" 是一个礼貌用语，意思是 "谢谢"，是对别人帮助或礼貌行为的回应。

"My dear" 意思是 "亲爱的"，是一种称呼或称赞的说法。

"Mother" 意思是 "妈妈"，是对女性的称呼。

例句：

"Thank you, Mom, for always being there for me." (谢谢妈妈，你一直都在我身边。)
"My dear mother, thank you for your love and support." (亲爱的妈妈，谢谢你的爱和支持。)
"Thank you, Mom, for cooking dinner for us tonight." (谢谢妈妈，你今晚为我们做晚饭。)