undercrown

常见例句

• This is done by direct heat transfer through the oil film to the cylinder walls and on to the cooling system.Heat is also carried by the oil from the undercrown and skirt to the crankcase.
  热量通过油膜至气缸壁再至冷却系统，热量也可由机油从裙部带至曲轴。
• undercrown surface
  活塞顶内表面
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