Maceral
煤中矿物组分的细微组织, 煤素质
🗣️ 情景例句
Some think that all's fair in business.
一些人以为商界的一切都是公平的。
Nothing is so certain as the unexpected.
天有不测风云，人有旦夕祸福。
Forty-two years later a tunnel was actually begun.
42年以后，隧道实际已经开始建了。