inner pyrolytic carbon layer是什么意思

用法例句

The TRISO type coated fuel particle consists of a microspheric fuel kernel surrounded by four layers: a porous pyrolytic carbon(PYC),an inner dense PYC, a pyrolytic silicon carbide and an outer dense PYC.

ＴＲＩＳＯ型包覆燃料颗粒是由燃料核芯、疏松热解碳层、内致密热解碳层、碳化硅层和外致密热解碳层组成。