双光束显微分光光度计

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

double standard

double magnet gun

Closure of enterostomy or Colostomy （loop or double-barrel ）

double vagina

homopolymers of aliphatic hydrocarbons, unsaturated having three or more double bonds

double-acting

double balloon catheter