最近发现了一个据估计有近500,000年历史的沉积物，该沉积物由木炭、燃烧的动物骨头和烧焦的岩石组成。
A site containing a deposit, estimated to be nearly 500,000 years old, consisting of charcoal, burned animal bones, and charred rocks, has recently been found.
在比较高的温度下，自动变速器油燃烧，导致它失去润滑性能并氧化，致使在整个变速器里留下沉积物。
At higher temperature the transmission fluid burns loosing its lubricating qualities and becomes oxidized leaving deposits all over inside the transmission.
这些沉积物很容易发生自燃，称为空气预热器的二次燃烧，需要对空气预热器进行热点检测来加以预防。
These sediments are prone to spontaneous combustion, which is known as the secondary combustion air preheater. The need for air preheater's hot spot detection to prevent them is necessary.
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