The interaction of flow speed and flame speed influences the flash back.

而气流速度和火焰传播速度的相互关系对回火有很大的影响.

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All photos were taken at an angle to prevent camera flash - back.

为防止照像机闪光反弹﹐以下每一张照片拍摄时都带有一些角度.

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From that year til now, what had happened? Let flash back to history.

当年到今日, 到底发生甚麽事? 让我们翻开历史.

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