1. arrive suddenly and unannounced. 
   突然地并且未经宣布地到达。
2. Match your skill against the experts in this quiz. 
   在这一测验中你与专家较量一下技巧吧。
3. Having arrived unannounced for supper, we had to take potluck. 
   由于没有提前通知我们要来吃晚饭，我们只能吃些家常便饭
4. having arrived unannounced we had to take potluck; a potluck supper. 
   我们未提前告知就来了，所以只好吃家常便饭。
5. The unannounced design institutes cannot be engaged in design for relevant water project construction.  
   未经公告的设计单位不得从事相应等级的水利工程设计。

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