Ulmain
凝胶化植物质煤
🗣️ 情景例句
Remember your father-in-law's a pediatrician.
记住你公公是小儿科医师。
Do you often study history on Saturday?
你常常在星期六学历史吗？
Can you ask her to ring me back, please?
你能请她给我回个电话吗？