Natural weathering rates are limited by, among other factors, the exposed surface area of chemically reactive rock.
自然风化的速度受进行化学反应岩石的接触表面积等因素限制。
The advantage of the mound fire is that it can be built on flat exposed rock or on an organic surface such as litter, duff or grass.
堆火的好处在于它既够在平整暴露的岩石地面进行，又可以在象干草落叶一样的有机物轮廓进行。
The sensible heat factor decreases with the increase of ventilation time after the rock surface is exposed due to the decrease of the surface temperature of the rock.
通风开始后，壁面温度随着暴露时间的增长而降低，显热比也随通风时间增长而降低。
The sensible heat factor decreases with the increase of ventilation time after the rock surface is exposed due to the decrease of the surface temperature of the rock.
通风开始后，壁面温度随着暴露时间的增长而降低，显热比也随通风时间增长而降低。
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