The intake and exhaust valve opening times will overlap as RPMs rise, recycling some of the charge the outgoing air creates.
进气和排气的气门开合时间随着转速的提高相互交叠，循环着将废气排出。
Radiation frost occurs on clear nights with little or no wind when the outgoing radiation is excessive and the air temperatures is not necessarily at the freezing point.
辐射霜出现在几乎无风的晴朗的夜晚，此时向外辐射过多，同时气温并不一定在冰点。
High cleaning performance due to high capacity filter for filtering the outgoing air from undesired particles.
高效的清洁性能源于大容量过滤器过滤排风中的尘粒。
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