Bdf
[医][=B cell differentiation factor]B细胞分化因子
🗣️ 情景例句
It's not as bad as all that.
事情没有那么糟。
The music turns me off.
这种音乐让我腻烦。
for it is then almost ready to undertake heavy work and can begin to earn its keep straight away.
这个年龄的象差不多已能干重活，可以很快挣回饲养它的开支。