自由核

duty-free shop

free out (FO)

free clinic

Free Passage

exarate pupa【昆】;free pupa【昆】;pupa exarata【昆】

distortion-free【电子】;distortionless【电子】;orthoscopic【物】

risk free rate【金融】

cyanide-free cadmium (electro)-plating on powder metallurgy castings