1. torsional vibration of engine crankshaft 
   内燃机轴系扭转振动
2. the stroke of an engine piston moving toward the crankshaft. 
   蒸汽机或其他发动机中活塞向曲轴推动的冲程。
3. the stroke of an engine piston moving away from the crankshaft. 
   蒸汽机或其他发动机的活塞离开曲轴运动时的冲程。
4. An inward stroke, especially a piston stroke moving away from the crankshaft. 
   内冲程向内的冲程，尤指从曲轴移回的活塞冲程
5. The metal case enclosing the crankshaft and associated parts in a reciprocating engine. 
   曲柄轴箱在往复式发动机内将曲柄轴和相关部件包住的金属箱子

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