例句
She slipped the birthday card into a blue envelope.
她把生日贺卡放进了一个蓝色信封。
Although digital communication is widespread, official documents are still sometimes delivered in a sealed envelope for privacy.
尽管数字通信十分普及，官方文件有时仍会装在密封信封里送达，以保护隐私。
常用搭配
- a sealed envelope｜密封的信封
- open an envelope｜拆信封
- a padded envelope｜有衬垫的信封
用法提示
envelope是“信封”；envelop是“包围”的动词。