Stf
[医][=serum thymus factor]血清胸腺因子
🗣️ 情景例句
Mr. Levine, Susan Stewart.
Levine先生， 我是Susan Stewart。
He that knows not how to hold his tongue knows not how to talk.
不知缄口的不善言。
Yes, Miss Zhao. answered the students. Now, who is on duty today?
“好的，赵小姐，”同学们回答。“今天谁值日？”