signal-book

例句：

1. 1. The engineer kept a detailed record of all the signals he received during his mission.
   这位工程师详细记录了他任务期间收到的所有信号。
2. 2. The old map was used as a signal book to warn other ships of approaching danger.
   旧地图被用作信号书，警告其他船只注意接近的危险。
3. 3. The team leader kept a signal book for each member to reference in case of emergency.
   团队领导为每个成员准备了一本信号书，以备紧急情况参考。