Monoerg
同种抗原抗血清, 单应性抗血清
🗣️ 情景例句
There's another advanced class today at four o'clock.
今天下午四点钟还有一次高级班。
Did everyone you invited show up?
你邀请的人都来了吗？
The doctor began to operate on the boy.
医生开始给那个男孩动手术。