you shouldn't have idiom
（当别人给你礼物时，用来表示你没有期待如此）
said when thanking someone who has given you a present, to mean that you did not expect it
Flowers! You shouldn't have! “给我的鲜花！你不必送的！”
英汉双解词典收录81607条英汉双解翻译词条，基本涵盖了全部常用单词的读音、翻译及用法，是英语学习的有利工具。