Bdf
[醫][=B cell differentiation factor]B細胞分化因子
??? 情景例句
I'm glad I ran into you. Where have you been hiding lately?
我很高興碰見你，你躲到哪里去了？
Whom God would ruin, he first deprives of reason.
傷天害理，天誅地滅。
I saw him playing football on the playground.
我看見他在操場上踢足球。