Collinite
凝胶煤素质; 无结构腐殖体
🗣️ 情景例句
We were very young.
我们那时很年轻。
Do you know the boy whose aunt is an artist?
你知道那男孩的姑妈是艺术家?
I had a little accident last Sunday.
上星期天我出了个小事故。