call sign

• n. (船舶的)信号
• (电台的)呼号.

例句

用作名词 (n.)

1. Lucy's distress call was heard by the corvette.
   驱潜快艇听到了露西的呼救信号。
2. There's a diversion sign behind the lorry.
   那辆卡车后面发出了转向的信号。