Once a sheet was used to encode a message, it was torn off the pad and destroyed.

一旦便笺被用于编码信息，它就会从便笺簿上被扯下来销毁。

youdao

Once a sheet was used to encode a message, it was torn off the pad and destroyed.

一旦便笺被用于编码信息，它就会从便笺簿上被扯下来销毁。

youdao