Bdf
[医][=B cell differentiation factor]B细胞分化因子
🗣️ 情景例句
For a year or two
在一两年内
He is eating a little.
他只吃了一点儿。
An advertisement which begins with the magic word FREE can rarely go wrong.
凡是用“免费”这个神奇的词开头的广告很少会失败的。