ABout 3 additional hours are required to install new piston rings. Additional time is needed for such services as piston-pin or Bushing replacement.是什么意思_ABout 3 additional hours are required to install new piston rings. Additional time is needed for such services as piston-pin or Bushing replacement.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句