Further, letters are usually sent outside the organization, while memorandums are usually internal messages.

此外，信件通常发送到组织外部，而备忘录中通常是内部消息。

youdao

Further, letters are usually sent outside the organization, while memorandums are usually internal messages.

此外，信件通常发送到组织外部，而备忘录中通常是内部消息。

youdao