安装在一个区域的多个部位，实现轮机员安全监控和求救的功能。
To be installed in needed area, It used for help by engineer.
在任何时候，负责值班的轮机员的主要职责都应是对影响船舶安全的机械设备进行安全有效的使用和保养。
At all times, the primary responsibility of the engineer officer in charge of watch should be safe and efficient operation and upkeep of machinery affecting the safety of the ship.
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