valve overlap
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这时期被称为气门重叠。
This period of time is known as valve overlap.
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配气正时和气门重叠变通用于不同的发动机。
Valve timing and valve overlap vary on different engines.
不同的发动机，其配气相位和气门重叠是不一样的。
This is called valve overlap. Valve timing and valve overlap vary on different engines.
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