Bdf
[医][=B cell differentiation factor]B细胞分化因子
🗣️ 情景例句
I know who you are.
我知道你是谁。
By the side of sickness health becomes sweet.
和疾病相比较，才显得健康的可贵。
His previous attempts had been unsuccessful.
他以前的尝试没有成功。