Stf
[医][=serum thymus factor]血清胸腺因子
🗣️ 情景例句
He always performs his tasks perfectly.
他总是圆满地完成工作。
Who is calling, please?
请问你是谁？
In the contrary school, the duck is supreme.
与滑翔鸟相对的另一类鸟中，数野鸭本领最高。