Maceral
煤中矿物组分的细微组织, 煤素质
🗣️ 情景例句
Is Robbie Stewart there?
Robbie Stewart在吗？
Practice is better than precept.
身教胜于言教。
Yes, your last shipment wasn't up to par.
嗯，你上次送去的货没有达到标准。