单词	堊筆
释义	堊筆 è bǐ粉笔。垩笔
随便看	degradation sheet degradation signal degradation soil Degradation,Soil Degradation speed degradation state degradation states degradation strain degradation stratum Degradation substance degradation succession degradation sugars degradation terrace Degradation test degradation testing degradation the of rumen degradation theory degradation tower Degradation trend degradation trends degradation with aging degradation with shearing degradative degradative benzoylation degradative chain transfer