Maceral
煤中矿物组分的细微组织, 煤素质
🗣️ 情景例句
My favorite food is pork chops.
我最喜欢的食物是小猪排。
Today is the first day of spring.
今天是春天的第一天。
Spiders are busy for at least half the year in killing insects.
蜘蛛至少有半年在忙于吃昆虫。