Bdf
[医][=B cell differentiation factor]B细胞分化因子
🗣️ 情景例句
Richard, isn't that too much to ask of your mother?
Richard，那是不是太麻烦你母亲啦？
We can assure you that our products are the most outstanding ones on the market today, and we offer a five-year guarantee.
我们可以向您保证我方产品是当今市场上最好的，并且可提供5年保修期。
There are a lot of people in the swimming pool.
游泳池里挤满了人。