【建筑】双层窗户【电学】双层窗户

Double blade sword,A Double-edged Sword,A Two-Edged Sword,Two-sided Sword

double-strength

anti-dsDNA antibody, anti-double-stranded DNA antibody

double dissociation

double screw-teeth bit【木】

double mirror

isolated double bond

with fuse preventing double recording, accidental deleting