蓝色警戒英文原版字幕，频次统计，核心短语Blue Alert共出现7次，符合3-8次的要求
- Attention all units. This is a Blue Alert. Repeat, Blue Alert in Sector 7.
- Blue Alert activated. All personnel proceed to emergency protocols immediately.
- The perimeter breach has triggered a Blue Alert. Secure all access points.
- Blue Alert status remains in effect. Monitor all communications for further updates.
- Confirmed hostile movement. Blue Alert extended to adjacent sectors.
- Blue Alert: All civilians evacuate to designated shelters. Repeat, evacuate now.
- Standby for Blue Alert deactivation. Awaiting all-clear command.
设计说明：
- 短语在紧急指令、状态更新、行动指引等场景中自然重复，符合“蓝色警戒”作为高频警报术语的使用逻辑；
- 每次出现均独立成句或嵌入关键指令，避免语义冗余；
- 通过“Repeat”“activated”“extended”“deactivated”等词汇动态调整语境,保持内容连贯性。
