曲拐是大型船用发动机曲轴的重要部件。
Crank is a very important component of crankshaft in large Marine engine.
发动机的曲轴断了。
为了启动发动机，曲轴必须先运转起来。
In order to start them, the engine crankshaft must be turned over.
曲轴箱是发动机气缸体较低的部分。
The crankcase is the lower part of the engine cylinder block .
曲轴箱是发动机气缸体较低的部分。
The crankcase is the lower part of the engine cylinder block .
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