Epitetracycline
差向四環素
??? 情景例句
I think you are getting off the subject. Could we get back to the main point, please?
我覺得你跑題了。 我們能不能回到主題上來？
Call me tomorrow if you have time.
明天要有時間就給我打個電話。
I'm afraid I don't understand.
恐怕我還不明白您的意思。