书面邀请的英文：
written invitation

written是什么意思：
adj. 书面的，成文的，文字的
v. write的过去分词

There is a written protocol.
这有一个书面草案。

It is written by an obscure young poet.
这是一位不知名的年轻诗人写的。

The song is written in the key of D.
这首歌是用D调谱写的。

The equations are written in rectangular coordinates.
这些方程是在直角座标系中写出的。

The letter is written in a formal style.
这封信以正式文体写成。

invitation是什么意思：
n. 邀请；请柬；引诱

Whomever you invite will be welcome.
你邀请的任何人都将受欢迎。

He was upset at not being invited.
人家没邀请他，他很不痛快.

A Bad padlock invites a picklock
坏锁招人撬

Entry to this competition is by invitation only.
此次竞赛的参赛只凭邀请函。

She was favored with an invitation.
她受到了邀请。