Bsf
abbr. backscatter factor 背（向）散射因素; beta-s-fetoprotein β-S-胎蛋白; bulk shielding facilities 整体屏蔽设备（反应堆）
🗣️ 情景例句
I'm afraid so.
不敢当。
It's a bit too hard.
这有点太难了吧。
No, I think it'll be all right for him to go to school.
不，我想他去上学没什么关系。