night signaling

例句：

1. 1.The military has been using night signaling to communicate with their forces in the field.
   军队一直在使用夜间信号与前线部队进行通信。
2. 2.The police used night signaling to alert the public about a potential threat.
   警方使用夜间信号向公众发出潜在威胁的警报。
3. 3.During the night, they were able to use night signaling to avoid detection by enemy forces.
   在夜间，他们能够使用夜间信号来避免被敌军发现。