在煤样分析中，镜质体的高反射率有助于识别其植物来源。

In coal analysis, the high reflectance of ___vitrinite helps identify its plant origin.

通过观察镜质组反射率，可以准确判断煤炭的成熟度。

The reflectance of ___vitrinite helps geologists evaluate the maturity level of coal samples.