感谢在美国期间你所提供的帮助 一本英语词典忘记带回，请你帮我寄回来 词典是美国老师送的，非常珍贵

Thanks for your help during my stay in America. Unfortunately I left my English dictionary when I came back.Could you send it for me?I treasure it very much because it's a gift from my American teacher.