Monoerg
同种抗原抗血清, 单应性抗血清
🗣️ 情景例句
Just got back. It's good to see you both again.
刚刚回来。真幸运再次见到你们二位。
Is this book his?
这本书是他的吗？
Number 13 buses run much more frequently, don't they?
13路车跑得更勤，是不是？