Regrading
二次筛分
🗣️ 情景例句
Come on, Albert, you can help us!
走 ，Albert， 你来帮忙！
Please give me your advice.
请给我提些建议。
Mr. Green doesn't climb down the chimney. He waits until the children are asleep.
格林先生不从烟囱上爬下来，他等候孩子们都睡熟。