The most important safety valve as far as food supply is concerned is the short production cycle.

就粮食供应来说最重要的安全阀是短生产周期。

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The cycle of operation of the four-stoke engine begins with the piston at TDC and the intake valve open.

四冲程发动机的工作循环是以活塞在上止点、进气门打开为开始的。

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Four-stroke engines of this type with this same type of intake valve motion but with a supercharger to make up for the loss of power density are known as Miller cycle engines.

四冲程发动机本与此同进气阀运动类型的类型，但以使增压器的功率损耗密度，这些都是为米勒循环发动机众所周知的。

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