first aid at sea

例句：

1. 1.The crew members were trained to perform first aid at sea.
   船员们接受了海上急救训练。
2. 2.The ship's doctor was called to provide first aid at sea.
   船上的医生被叫来提供海上急救。
3. 3.In case of an emergency, the crew must know how to perform first aid at sea.
   在紧急情况下，船员必须知道如何进行海上急救。