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.
  熱量通過油膜至氣缸壁再至冷卻系統，熱量也可由機油從裙部帶至曲軸。
• undercrown surface
  活塞頂內表麪
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