It was unfortunate that she had erased the message.

不幸的是她已经删除了那条短信。

youdao

In the normal course of events, clay dissolves and disappears, and any message on it is erased.

因为在一般的情况下,粘土会分崩离析,所有的信息将灰飞烟灭

耶鲁公开课 - 古希腊历史简介课程节选

But after the time limit specified by the sender, the decryption key is erased from Disappearing's key server, making the message unreadable and effectively destroying it, even if the recipient stored it.

CNN: Make your e-mail disappear