乳、恒牙的临床鉴别要点有哪些?

短文改错(10分)

I’m glad to write to you. It is near a month since you had left our hospital. I’m still worried about you. How are you get along these days? I think you may be much better now, but I’d better have a good rest and take good care of yourselves since you are sixty-year-old man. I still remember those days which you helped me to my English. With your help, I make good progress. But to my regret, my English remains very poor through I have made good use of my time. Can you give me some advice on it?