this is our engine room there are a lot of machines in it, this is the main engine ,and that is the donkey boiler .there are two cooling systems in it. one is the sea water cooling system, the other is the fresh water cooling system. there are also some auxiliary machinery, three generators, two oil separators and a preheater near the oil separators .in out engine room ,there are many pumps,motors and valves,too. 英语第一课