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
Are you all right?
你还好吗？
If he doesn't play, who will?
如果他不，谁要去玩？
2-10-net-30.
2-10-net -30。