Bdf
[医][=B cell differentiation factor]B细胞分化因子
🗣️ 情景例句
Let's look on the bright side.
我们来看看它好的一面。
He gave her his word that he would never be late again.
他向她保证，绝不再迟到。
Twenty year!That's long time.
20年！这个时间可不短。