Collinite
凝胶煤素质; 无结构腐殖体
🗣️ 情景例句
Well, that'll be eighteen dollars and seventy cents.
嗯 ，十八美元七毛。
I wrote several letters on my mother's behalf.
我代表我母亲写了几封信。
Neither of the men spoke.
两个人都没说过话。