Bdf
[医][=B cell differentiation factor]B细胞分化因子
🗣️ 情景例句
using as many letters as possible.
尽可能多用字母，
It's the kind of work I've always wanted to do.
它是我常常想做的工作。
The picnic basket was no longer under the tree.
树下的野餐篮不见了。