Stf
[医][=serum thymus factor]血清胸腺因子
🗣️ 情景例句
You've been very thoughtful.
你一直都很周到。
Scanderbeg's sword must have Scanderbeg's arm.
斯坎德培（阿尔巴尼亚15世纪的民族英雄）的剑，必须要有斯坎德培的臂才能举；宝剑须由烈士擎。
Have you cleared your luggage with customs?
你的行李通关了吗？