Collinite
凝胶煤素质; 无结构腐殖体
🗣️ 情景例句
You're sure Alexandra's going to be surprised?
你确定Alexandra会很惊讶吗？
Do you like going to see painting exhibition?
你喜欢参观画展？
Is it cold or warm in autumn?
秋季的天气是冷还是暖呢？