一些信封用英文怎么说

"信封"在英语中被称为"envelope"。

来源：该词来源于拉丁语"involvere"，意思是"包裹"。

例句：

Please put the letter in an envelope and mail it to me. (请把信装进信封里再寄给我。)
I found an envelope on the floor with no name on it. (我在地上发现了一个没有名字的信封。)
Can you hand me an envelope from that drawer? (你能把那个抽屉里的信封给我吗？)