它描述了一艘可以在海上航行几百年的船，这归功于不断的维修和部件的替换。
It describes a ship that remained seaworthy for hundreds of years thanks to constant repairs and replacement parts.
电液控制单元是船用舵机电液位置伺服系统关键部件，其性能的优劣直接影响舵机的性能。
Electrohydraulic control unit whose performance has direct effect on rudder's characteristics is the key component of ship rudder position control system.
船用曲轴是大型船用发动机的重要部件，而曲拐是曲轴的关键部分。
Crankshaft is a very important component of large Marine engine and its key part is crank.
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