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
take a vacation away from the family--alone.
离开家人而单独在一起渡个假。
How much should people demand of their governments?
国民对其政府应该要求多少呢？
What are you doing, Li Lei?
李垒，你在做什么？