Of course, due to the chemical structure changes are difficult to quantify, the impact study minerals Excluding these effects is difficult, Research and char are able to circumvent these difficulties.

• 当然，由于化学结构的变化难以定量计算，要在研究矿物质影响时扣除这些影响是困难的，而研究煤焦可以绕开这些难题。