the more economic engine, hydraulically operated

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  机译： 通过液压操作的更多经济引擎

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  机译： 带液压阀工作机理的内燃发动机的气门正时机构及带液压阀工作机理的内燃发动机的气门正时液压系统

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  机译： 用于内燃机的换气阀的压电液压操作装置必须操作换气阀，非密封的液压传动系统始终与内燃机的油压回路连接

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