不速之客

例句：

1. 1. The unexpected arrivalof a friend was a pleasant surprise.
   朋友的意外到来是一个愉快的惊喜。
2. 2. He welcomedthe newcomer with open arms.
   他热情地欢迎新来的客人。
3. 3. The guestswere delighted to be invited to the party.
   客人很高兴被邀请参加聚会。