assembled crankshaft ; built-up crankshaft
半组合式曲轴 half built-up crank shaft ; up crank shaft
组合式曲轴臂 built-up crankshaft web
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曲轴是大型船用发动机的重要部件，大型船用组合式曲轴的曲柄是组成大型曲轴的关键零件。
Crankshaft is a very important component of large Marine engine and its key component is crank.
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