This type of letter is an outgoing letter and maybe called a "first Enquiry".

这种类型的信函或许可被称为“第一次询价?。

youdao

To speak a letter (outgoing), you need to apply to yet another room.

要说出一个字母(输出)，你还需要向另一个地方申请。

youdao

To speak a letter (outgoing), you need to apply to yet another room.

要说出一个字母(输出)，你还需要向另一个地方申请。

youdao