1·People will expect an answer even to an informal invitation.
但即使是非正式的邀请，人们也总是希望对此得到答复。
2·Letters of invitation include formal invitations and informal invitations.
邀请信有正式邀请信和非正式邀请信之分。
3·Yesterday our team also got an informal invitation to move and participate in a Chinese TV league that will go on for two months.
昨天我们队接到了一个非正式邀请，去中国参加一个电视联赛，为期两个月。
4·At the general counsel's invitation, the "think group" had assembled in his home and was sprawled around an informal comfortable garden room.
应法律总顾问的邀请，“智囊团”人员在他家聚会，懒散地伸着四肢坐在一间简易而舒适的花园房子里。
5·At the general counsel's invitation, the "think group" had assembled in his home and was sprawled around an informal comfortable garden room.
应法律总顾问的邀请，“智囊团”人员在他家聚会，懒散地伸著四肢坐在一间简易而舒适的花园房子里。