舰队解难演习 Fleet Problems

灾难演习 DR rehearsal

潜艇救难演习 submarine selvage exercise

灾难恢复演习 Disaster Recovery Exercise ; Disaster Recovery Fire Drill

难修复应急演练 Disaster Recovery Drill

难忘的演讲 Memorable discourses

难忘的演出 a classic performance

灾难恢复]演习 mock drill

一次终生难忘的演示 An illustrationnever forget

难得有奇遇演唱会 The unheard of Chyi