invitation letter

读音：英 [ˌɪnvɪˈteɪʃn ˈletə(r)]   美 [ˌɪnvɪˈteɪʃn ˈletər]  

意思：邀请书

例句：

I received his invitation letter to the party but I didn't accept it. 我收到了他的聚会邀请信,但是我没接受邀请。

Please attend the course with your business card and this invitation letter. 届时请携名片并凭邀请函入场。

Our company received the invitation letter yesterday, but I don't know who to send. 昨天公司收到邀请信，不知道派谁去。

近义词：

written invitation 请柬,请帖，书面邀请函

invitation card 请帖