Undeliverable
a. 无法投递的, 无法送达的
🗣️ 情景例句
You look very familiar. Have we been introduced before?
你看起来很面熟，我们以前互相介绍认识过吗？
Here you are , please check.
给你，请查一下。
I can't promise anything.
我还不能作出任何承诺。