letter opener
noun [ C ] mainly US uk/ˈlet.ər ˌəʊ.pən.ər/ us/ˈlet̬.ɚ ˌoʊ.pən.ɚ/ (UK usually paper knife)
拆信刀
a knife for opening envelopes that is not sharp and is often decorative
江苏热线英汉汉英双解词典包含207361条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。